- : unit = ()
h : heuristic = <heuristic>
- : unit = ()
APPLY CRITERIA (Marked dependency pairs)

TRS termination of:
[1] a__U11(tt,V2) -> a__U12(a__isNat(V2))
[2] a__U12(tt) -> tt
[3] a__U21(tt) -> tt
[4] a__U31(tt,V2) -> a__U32(a__isNat(V2))
[5] a__U32(tt) -> tt
[6] a__U41(tt,N) -> mark(N)
[7] a__U51(tt,M,N) -> a__U52(a__isNat(N),M,N)
[8] a__U52(tt,M,N) -> s(a__plus(mark(N),mark(M)))
[9] a__U61(tt) -> 0
[10] a__U71(tt,M,N) -> a__U72(a__isNat(N),M,N)
[11] a__U72(tt,M,N) -> a__plus(a__x(mark(N),mark(M)),mark(N))
[12] a__isNat(0) -> tt
[13] a__isNat(plus(V1,V2)) -> a__U11(a__isNat(V1),V2)
[14] a__isNat(s(V1)) -> a__U21(a__isNat(V1))
[15] a__isNat(x(V1,V2)) -> a__U31(a__isNat(V1),V2)
[16] a__plus(N,0) -> a__U41(a__isNat(N),N)
[17] a__plus(N,s(M)) -> a__U51(a__isNat(M),M,N)
[18] a__x(N,0) -> a__U61(a__isNat(N))
[19] a__x(N,s(M)) -> a__U71(a__isNat(M),M,N)
[20] mark(U11(X1,X2)) -> a__U11(mark(X1),X2)
[21] mark(U12(X)) -> a__U12(mark(X))
[22] mark(isNat(X)) -> a__isNat(X)
[23] mark(U21(X)) -> a__U21(mark(X))
[24] mark(U31(X1,X2)) -> a__U31(mark(X1),X2)
[25] mark(U32(X)) -> a__U32(mark(X))
[26] mark(U41(X1,X2)) -> a__U41(mark(X1),X2)
[27] mark(U51(X1,X2,X3)) -> a__U51(mark(X1),X2,X3)
[28] mark(U52(X1,X2,X3)) -> a__U52(mark(X1),X2,X3)
[29] mark(plus(X1,X2)) -> a__plus(mark(X1),mark(X2))
[30] mark(U61(X)) -> a__U61(mark(X))
[31] mark(U71(X1,X2,X3)) -> a__U71(mark(X1),X2,X3)
[32] mark(U72(X1,X2,X3)) -> a__U72(mark(X1),X2,X3)
[33] mark(x(X1,X2)) -> a__x(mark(X1),mark(X2))
[34] mark(tt) -> tt
[35] mark(s(X)) -> s(mark(X))
[36] mark(0) -> 0
[37] a__U11(X1,X2) -> U11(X1,X2)
[38] a__U12(X) -> U12(X)
[39] a__isNat(X) -> isNat(X)
[40] a__U21(X) -> U21(X)
[41] a__U31(X1,X2) -> U31(X1,X2)
[42] a__U32(X) -> U32(X)
[43] a__U41(X1,X2) -> U41(X1,X2)
[44] a__U51(X1,X2,X3) -> U51(X1,X2,X3)
[45] a__U52(X1,X2,X3) -> U52(X1,X2,X3)
[46] a__plus(X1,X2) -> plus(X1,X2)
[47] a__U61(X) -> U61(X)
[48] a__U71(X1,X2,X3) -> U71(X1,X2,X3)
[49] a__U72(X1,X2,X3) -> U72(X1,X2,X3)
[50] a__x(X1,X2) -> x(X1,X2)


Sub problem: 
guided: 

DP termination of:
<Marked_a__U11(tt,V2) , Marked_a__U12(a__isNat(V2))>
<Marked_a__U11(tt,V2) , Marked_a__isNat(V2)>
<Marked_a__U31(tt,V2) , Marked_a__U32(a__isNat(V2))>
<Marked_a__U31(tt,V2) , Marked_a__isNat(V2)>
<Marked_a__U41(tt,N) , Marked_mark(N)>
<Marked_a__U51(tt,M,N) , Marked_a__U52(a__isNat(N),M,N)>
<Marked_a__U51(tt,M,N) , Marked_a__isNat(N)>
<Marked_a__U52(tt,M,N) , Marked_a__plus(mark(N),mark(M))>
<Marked_a__U52(tt,M,N) , Marked_mark(N)>
<Marked_a__U52(tt,M,N) , Marked_mark(M)>
<Marked_a__U71(tt,M,N) , Marked_a__U72(a__isNat(N),M,N)>
<Marked_a__U71(tt,M,N) , Marked_a__isNat(N)>
<Marked_a__U72(tt,M,N) , Marked_a__plus(a__x(mark(N),mark(M)),mark(N))>
<Marked_a__U72(tt,M,N) , Marked_a__x(mark(N),mark(M))>
<Marked_a__U72(tt,M,N) , Marked_mark(N)>
<Marked_a__U72(tt,M,N) , Marked_mark(M)>
<Marked_a__U72(tt,M,N) , Marked_mark(N)>
<Marked_a__isNat(plus(V1,V2)) , Marked_a__U11(a__isNat(V1),V2)>
<Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)>
<Marked_a__isNat(s(V1)) , Marked_a__U21(a__isNat(V1))>
<Marked_a__isNat(s(V1)) , Marked_a__isNat(V1)>
<Marked_a__isNat(x(V1,V2)) , Marked_a__U31(a__isNat(V1),V2)>
<Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)>
<Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)>
<Marked_a__plus(N,0) , Marked_a__isNat(N)>
<Marked_a__plus(N,s(M)) , Marked_a__U51(a__isNat(M),M,N)>
<Marked_a__plus(N,s(M)) , Marked_a__isNat(M)>
<Marked_a__x(N,0) , Marked_a__U61(a__isNat(N))>
<Marked_a__x(N,0) , Marked_a__isNat(N)>
<Marked_a__x(N,s(M)) , Marked_a__U71(a__isNat(M),M,N)>
<Marked_a__x(N,s(M)) , Marked_a__isNat(M)>
<Marked_mark(U11(X1,X2)) , Marked_a__U11(mark(X1),X2)>
<Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
<Marked_mark(U12(X)) , Marked_a__U12(mark(X))>
<Marked_mark(U12(X)) , Marked_mark(X)>
<Marked_mark(isNat(X)) , Marked_a__isNat(X)>
<Marked_mark(U21(X)) , Marked_a__U21(mark(X))>
<Marked_mark(U21(X)) , Marked_mark(X)>
<Marked_mark(U31(X1,X2)) , Marked_a__U31(mark(X1),X2)>
<Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
<Marked_mark(U32(X)) , Marked_a__U32(mark(X))>
<Marked_mark(U32(X)) , Marked_mark(X)>
<Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
<Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
<Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
<Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
<Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
<Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
<Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
<Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
<Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
<Marked_mark(U61(X)) , Marked_a__U61(mark(X))>
<Marked_mark(U61(X)) , Marked_mark(X)>
<Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
<Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
<Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
<Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
<Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
<Marked_mark(x(X1,X2)) , Marked_mark(X1)>
<Marked_mark(x(X1,X2)) , Marked_mark(X2)>
<Marked_mark(s(X)) , Marked_mark(X)>
 
END GUIDED
APPLY CRITERIA (Graph splitting)
Found 2 components:

{  <Marked_mark(s(X)) , Marked_mark(X)> 
      --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(s(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))> 
     --> <Marked_a__x(N,s(M)) , Marked_a__U71(a__isNat(M),M,N)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(N)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(M)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(N)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_a__x(mark(N),mark(M))>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_a__plus(a__x(mark(N),mark(M)),mark(N))>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)> 
     --> <Marked_a__U71(tt,M,N) , Marked_a__U72(a__isNat(N),M,N)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))> 
     --> <Marked_a__plus(N,s(M)) , Marked_a__U51(a__isNat(M),M,N)>
  <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))> 
     --> <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)> 
     --> <Marked_a__U52(tt,M,N) , Marked_mark(M)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)> 
     --> <Marked_a__U52(tt,M,N) , Marked_mark(N)>
  <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)> 
     --> <Marked_a__U52(tt,M,N) , Marked_a__plus(mark(N),mark(M))>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)> 
     --> <Marked_a__U51(tt,M,N) , Marked_a__U52(a__isNat(N),M,N)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)> 
     --> <Marked_a__U41(tt,N) , Marked_mark(N)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__x(N,s(M)) , Marked_a__U71(a__isNat(M),M,N)> 
     --> <Marked_a__U71(tt,M,N) , Marked_a__U72(a__isNat(N),M,N)>
  <Marked_a__plus(N,s(M)) , Marked_a__U51(a__isNat(M),M,N)> 
     --> <Marked_a__U51(tt,M,N) , Marked_a__U52(a__isNat(N),M,N)>
  <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)> 
     --> <Marked_a__U41(tt,N) , Marked_mark(N)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_a__x(mark(N),mark(M))> 
     --> <Marked_a__x(N,s(M)) , Marked_a__U71(a__isNat(M),M,N)>
  <Marked_a__U72(tt,M,N) , Marked_a__plus(a__x(mark(N),mark(M)),mark(N))> 
     --> <Marked_a__plus(N,s(M)) , Marked_a__U51(a__isNat(M),M,N)>
  <Marked_a__U72(tt,M,N) , Marked_a__plus(a__x(mark(N),mark(M)),mark(N))> 
     --> <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)>
  <Marked_a__U71(tt,M,N) , Marked_a__U72(a__isNat(N),M,N)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(N)>
  <Marked_a__U71(tt,M,N) , Marked_a__U72(a__isNat(N),M,N)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(M)>
  <Marked_a__U71(tt,M,N) , Marked_a__U72(a__isNat(N),M,N)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(N)>
  <Marked_a__U71(tt,M,N) , Marked_a__U72(a__isNat(N),M,N)> 
     --> <Marked_a__U72(tt,M,N) , Marked_a__x(mark(N),mark(M))>
  <Marked_a__U71(tt,M,N) , Marked_a__U72(a__isNat(N),M,N)> 
     --> <Marked_a__U72(tt,M,N) , Marked_a__plus(a__x(mark(N),mark(M)),mark(N))>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U52(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U52(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U52(tt,M,N) , Marked_a__plus(mark(N),mark(M))> 
     --> <Marked_a__plus(N,s(M)) , Marked_a__U51(a__isNat(M),M,N)>
  <Marked_a__U52(tt,M,N) , Marked_a__plus(mark(N),mark(M))> 
     --> <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)>
  <Marked_a__U51(tt,M,N) , Marked_a__U52(a__isNat(N),M,N)> 
     --> <Marked_a__U52(tt,M,N) , Marked_mark(M)>
  <Marked_a__U51(tt,M,N) , Marked_a__U52(a__isNat(N),M,N)> 
     --> <Marked_a__U52(tt,M,N) , Marked_mark(N)>
  <Marked_a__U51(tt,M,N) , Marked_a__U52(a__isNat(N),M,N)> 
     --> <Marked_a__U52(tt,M,N) , Marked_a__plus(mark(N),mark(M))>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(s(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_a__x(mark(X1),mark(X2))>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U52(X1,X2,X3)) , Marked_a__U52(mark(X1),X2,X3)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U51(X1,X2,X3)) , Marked_a__U51(mark(X1),X2,X3)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
}

{  <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)> 
      --> <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__U31(a__isNat(V1),V2)>
  <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(s(V1)) , Marked_a__isNat(V1)>
  <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__U11(a__isNat(V1),V2)>
  <Marked_a__isNat(x(V1,V2)) , Marked_a__U31(a__isNat(V1),V2)> 
     --> <Marked_a__U31(tt,V2) , Marked_a__isNat(V2)>
  <Marked_a__isNat(s(V1)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__isNat(s(V1)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__U31(a__isNat(V1),V2)>
  <Marked_a__isNat(s(V1)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(s(V1)) , Marked_a__isNat(V1)>
  <Marked_a__isNat(s(V1)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__isNat(s(V1)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__U11(a__isNat(V1),V2)>
  <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__U31(a__isNat(V1),V2)>
  <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(s(V1)) , Marked_a__isNat(V1)>
  <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__U11(a__isNat(V1),V2)>
  <Marked_a__isNat(plus(V1,V2)) , Marked_a__U11(a__isNat(V1),V2)> 
     --> <Marked_a__U11(tt,V2) , Marked_a__isNat(V2)>
  <Marked_a__U31(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__U31(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__U31(a__isNat(V1),V2)>
  <Marked_a__U31(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(s(V1)) , Marked_a__isNat(V1)>
  <Marked_a__U31(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__U31(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__U11(a__isNat(V1),V2)>
  <Marked_a__U11(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__U11(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__U31(a__isNat(V1),V2)>
  <Marked_a__U11(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(s(V1)) , Marked_a__isNat(V1)>
  <Marked_a__U11(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__U11(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__U11(a__isNat(V1),V2)>
}
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_a__x(N,s(M)) >= Marked_a__U71(a__isNat(M),M,N) ;
  Marked_a__U72(tt,M,N) >= Marked_a__x(mark(N),mark(M)) ;
  Marked_a__U72(tt,M,N) >= Marked_a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  Marked_a__U72(tt,M,N) >= Marked_mark(N) ;
  Marked_a__U72(tt,M,N) >= Marked_mark(M) ;
  Marked_a__U71(tt,M,N) >= Marked_a__U72(a__isNat(N),M,N) ;
  Marked_a__plus(N,s(M)) >= Marked_a__U51(a__isNat(M),M,N) ;
  Marked_a__plus(N,0) >= Marked_a__U41(a__isNat(N),N) ;
  Marked_a__U52(tt,M,N) >= Marked_a__plus(mark(N),mark(M)) ;
  Marked_a__U52(tt,M,N) >= Marked_mark(N) ;
  Marked_a__U52(tt,M,N) >= Marked_mark(M) ;
  Marked_a__U51(tt,M,N) >= Marked_a__U52(a__isNat(N),M,N) ;
  Marked_a__U41(tt,N) >= Marked_mark(N) ;
  Marked_mark(s(X)) >= Marked_mark(X) ;
  Marked_mark(plus(X1,X2)) >= Marked_a__plus(mark(X1),mark(X2)) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X2) ;
  Marked_mark(x(X1,X2)) >= Marked_a__x(mark(X1),mark(X2)) ;
  Marked_mark(x(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(x(X1,X2)) >= Marked_mark(X2) ;
  Marked_mark(U11(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U12(X)) >= Marked_mark(X) ;
  Marked_mark(U21(X)) >= Marked_mark(X) ;
  Marked_mark(U31(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U32(X)) >= Marked_mark(X) ;
  Marked_mark(U41(X1,X2)) >= Marked_a__U41(mark(X1),X2) ;
  Marked_mark(U41(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U51(X1,X2,X3)) >= Marked_a__U51(mark(X1),X2,X3) ;
  Marked_mark(U51(X1,X2,X3)) >= Marked_mark(X1) ;
  Marked_mark(U52(X1,X2,X3)) >= Marked_a__U52(mark(X1),X2,X3) ;
  Marked_mark(U52(X1,X2,X3)) >= Marked_mark(X1) ;
  Marked_mark(U61(X)) >= Marked_mark(X) ;
  Marked_mark(U71(X1,X2,X3)) >= Marked_a__U71(mark(X1),X2,X3) ;
  Marked_mark(U71(X1,X2,X3)) >= Marked_mark(X1) ;
  Marked_mark(U72(X1,X2,X3)) >= Marked_a__U72(mark(X1),X2,X3) ;
  Marked_mark(U72(X1,X2,X3)) >= Marked_mark(X1) ;
 }
 + Disjunctions:{ 
{
  Marked_a__x(N,s(M)) > Marked_a__U71(a__isNat(M),M,N) ;
 }
{
  Marked_a__U72(tt,M,N) > Marked_a__x(mark(N),mark(M)) ;
 }
{
  Marked_a__U72(tt,M,N) > Marked_a__plus(a__x(mark(N),mark(M)),mark(N)) ;
 }
{
  Marked_a__U72(tt,M,N) > Marked_mark(N) ;
 }
{
  Marked_a__U72(tt,M,N) > Marked_mark(M) ;
 }
{
  Marked_a__U71(tt,M,N) > Marked_a__U72(a__isNat(N),M,N) ;
 }
{
  Marked_a__plus(N,s(M)) > Marked_a__U51(a__isNat(M),M,N) ;
 }
{
  Marked_a__plus(N,0) > Marked_a__U41(a__isNat(N),N) ;
 }
{
  Marked_a__U52(tt,M,N) > Marked_a__plus(mark(N),mark(M)) ;
 }
{
  Marked_a__U52(tt,M,N) > Marked_mark(N) ;
 }
{
  Marked_a__U52(tt,M,N) > Marked_mark(M) ;
 }
{
  Marked_a__U51(tt,M,N) > Marked_a__U52(a__isNat(N),M,N) ;
 }
{
  Marked_a__U41(tt,N) > Marked_mark(N) ;
 }
{
  Marked_mark(s(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_a__plus(mark(X1),mark(X2)) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X2) ;
 }
{
  Marked_mark(x(X1,X2)) > Marked_a__x(mark(X1),mark(X2)) ;
 }
{
  Marked_mark(x(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(x(X1,X2)) > Marked_mark(X2) ;
 }
{
  Marked_mark(U11(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U12(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U21(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U31(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U32(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U41(X1,X2)) > Marked_a__U41(mark(X1),X2) ;
 }
{
  Marked_mark(U41(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U51(X1,X2,X3)) > Marked_a__U51(mark(X1),X2,X3) ;
 }
{
  Marked_mark(U51(X1,X2,X3)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U52(X1,X2,X3)) > Marked_a__U52(mark(X1),X2,X3) ;
 }
{
  Marked_mark(U52(X1,X2,X3)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U61(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U71(X1,X2,X3)) > Marked_a__U71(mark(X1),X2,X3) ;
 }
{
  Marked_mark(U71(X1,X2,X3)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U72(X1,X2,X3)) > Marked_a__U72(mark(X1),X2,X3) ;
 }
{
  Marked_mark(U72(X1,X2,X3)) > Marked_mark(X1) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
No solution found for these parameters.
Entering rpo_solver
=== TIMER virtual : 25.000000 ===
Search parameters: AFS type: 2 ; time limit: 25.. 
=== STOPING TIMER virtual ===
Time out for these parameters.
=== TIMER virtual : 15.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 15.000000 ===
=== STOPING TIMER real ===
Sat solver returned
Sat solver result read
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
constraint: a__U12(tt) >= tt
constraint: a__U12(X) >= U12(X)
constraint: a__isNat(s(V1)) >= a__U21(a__isNat(V1))
constraint: a__isNat(0) >= tt
constraint: a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2)
constraint: a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2)
constraint: a__isNat(X) >= isNat(X)
constraint: a__U11(tt,V2) >= a__U12(a__isNat(V2))
constraint: a__U11(X1,X2) >= U11(X1,X2)
constraint: a__U21(tt) >= tt
constraint: a__U21(X) >= U21(X)
constraint: a__U32(tt) >= tt
constraint: a__U32(X) >= U32(X)
constraint: a__U31(tt,V2) >= a__U32(a__isNat(V2))
constraint: a__U31(X1,X2) >= U31(X1,X2)
constraint: mark(tt) >= tt
constraint: mark(s(X)) >= s(mark(X))
constraint: mark(0) >= 0
constraint: mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2))
constraint: mark(x(X1,X2)) >= a__x(mark(X1),mark(X2))
constraint: mark(U11(X1,X2)) >= a__U11(mark(X1),X2)
constraint: mark(U12(X)) >= a__U12(mark(X))
constraint: mark(isNat(X)) >= a__isNat(X)
constraint: mark(U21(X)) >= a__U21(mark(X))
constraint: mark(U31(X1,X2)) >= a__U31(mark(X1),X2)
constraint: mark(U32(X)) >= a__U32(mark(X))
constraint: mark(U41(X1,X2)) >= a__U41(mark(X1),X2)
constraint: mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3)
constraint: mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3)
constraint: mark(U61(X)) >= a__U61(mark(X))
constraint: mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3)
constraint: mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3)
constraint: a__U41(tt,N) >= mark(N)
constraint: a__U41(X1,X2) >= U41(X1,X2)
constraint: a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M)))
constraint: a__U52(X1,X2,X3) >= U52(X1,X2,X3)
constraint: a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N)
constraint: a__U51(X1,X2,X3) >= U51(X1,X2,X3)
constraint: a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N)
constraint: a__plus(N,0) >= a__U41(a__isNat(N),N)
constraint: a__plus(X1,X2) >= plus(X1,X2)
constraint: a__U61(tt) >= 0
constraint: a__U61(X) >= U61(X)
constraint: a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N))
constraint: a__U72(X1,X2,X3) >= U72(X1,X2,X3)
constraint: a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N)
constraint: a__U71(X1,X2,X3) >= U71(X1,X2,X3)
constraint: a__x(N,s(M)) >= a__U71(a__isNat(M),M,N)
constraint: a__x(N,0) >= a__U61(a__isNat(N))
constraint: a__x(X1,X2) >= x(X1,X2)
constraint: Marked_a__x(N,s(M)) >= Marked_a__U71(a__isNat(M),M,N)
constraint: Marked_a__U72(tt,M,N) >= Marked_a__x(mark(N),mark(M))
constraint: Marked_a__U72(tt,M,N) >= Marked_a__plus(a__x(mark(N),mark(M)),
                                      mark(N))
constraint: Marked_a__U72(tt,M,N) >= Marked_mark(N)
constraint: Marked_a__U72(tt,M,N) >= Marked_mark(M)
constraint: Marked_a__U71(tt,M,N) >= Marked_a__U72(a__isNat(N),M,N)
constraint: Marked_a__plus(N,s(M)) >= Marked_a__U51(a__isNat(M),M,N)
constraint: Marked_a__plus(N,0) >= Marked_a__U41(a__isNat(N),N)
constraint: Marked_a__U52(tt,M,N) >= Marked_a__plus(mark(N),mark(M))
constraint: Marked_a__U52(tt,M,N) >= Marked_mark(N)
constraint: Marked_a__U52(tt,M,N) >= Marked_mark(M)
constraint: Marked_a__U51(tt,M,N) >= Marked_a__U52(a__isNat(N),M,N)
constraint: Marked_a__U41(tt,N) >= Marked_mark(N)
constraint: Marked_mark(s(X)) >= Marked_mark(X)
constraint: Marked_mark(plus(X1,X2)) >= Marked_a__plus(mark(X1),mark(X2))
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X2)
constraint: Marked_mark(x(X1,X2)) >= Marked_a__x(mark(X1),mark(X2))
constraint: Marked_mark(x(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(x(X1,X2)) >= Marked_mark(X2)
constraint: Marked_mark(U11(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U12(X)) >= Marked_mark(X)
constraint: Marked_mark(U21(X)) >= Marked_mark(X)
constraint: Marked_mark(U31(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U32(X)) >= Marked_mark(X)
constraint: Marked_mark(U41(X1,X2)) >= Marked_a__U41(mark(X1),X2)
constraint: Marked_mark(U41(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U51(X1,X2,X3)) >= Marked_a__U51(mark(X1),X2,X3)
constraint: Marked_mark(U51(X1,X2,X3)) >= Marked_mark(X1)
constraint: Marked_mark(U52(X1,X2,X3)) >= Marked_a__U52(mark(X1),X2,X3)
constraint: Marked_mark(U52(X1,X2,X3)) >= Marked_mark(X1)
constraint: Marked_mark(U61(X)) >= Marked_mark(X)
constraint: Marked_mark(U71(X1,X2,X3)) >= Marked_a__U71(mark(X1),X2,X3)
constraint: Marked_mark(U71(X1,X2,X3)) >= Marked_mark(X1)
constraint: Marked_mark(U72(X1,X2,X3)) >= Marked_a__U72(mark(X1),X2,X3)
constraint: Marked_mark(U72(X1,X2,X3)) >= Marked_mark(X1)
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_a__U31(tt,V2) >= Marked_a__isNat(V2) ;
  Marked_a__isNat(s(V1)) >= Marked_a__isNat(V1) ;
  Marked_a__isNat(plus(V1,V2)) >= Marked_a__isNat(V1) ;
  Marked_a__isNat(plus(V1,V2)) >= Marked_a__U11(a__isNat(V1),V2) ;
  Marked_a__isNat(x(V1,V2)) >= Marked_a__U31(a__isNat(V1),V2) ;
  Marked_a__isNat(x(V1,V2)) >= Marked_a__isNat(V1) ;
  Marked_a__U11(tt,V2) >= Marked_a__isNat(V2) ;
 }
 + Disjunctions:{ 
{
  Marked_a__U31(tt,V2) > Marked_a__isNat(V2) ;
 }
{
  Marked_a__isNat(s(V1)) > Marked_a__isNat(V1) ;
 }
{
  Marked_a__isNat(plus(V1,V2)) > Marked_a__isNat(V1) ;
 }
{
  Marked_a__isNat(plus(V1,V2)) > Marked_a__U11(a__isNat(V1),V2) ;
 }
{
  Marked_a__isNat(x(V1,V2)) > Marked_a__U31(a__isNat(V1),V2) ;
 }
{
  Marked_a__isNat(x(V1,V2)) > Marked_a__isNat(V1) ;
 }
{
  Marked_a__U11(tt,V2) > Marked_a__isNat(V2) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
No solution found for these parameters.
Entering rpo_solver
=== TIMER virtual : 25.000000 ===
Search parameters: AFS type: 2 ; time limit: 25.. 
=== STOPING TIMER virtual ===
Time out for these parameters.
=== TIMER virtual : 15.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 15.000000 ===
=== STOPING TIMER real ===
Sat solver returned
Sat solver result read
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
constraint: a__U12(tt) >= tt
constraint: a__U12(X) >= U12(X)
constraint: a__isNat(s(V1)) >= a__U21(a__isNat(V1))
constraint: a__isNat(0) >= tt
constraint: a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2)
constraint: a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2)
constraint: a__isNat(X) >= isNat(X)
constraint: a__U11(tt,V2) >= a__U12(a__isNat(V2))
constraint: a__U11(X1,X2) >= U11(X1,X2)
constraint: a__U21(tt) >= tt
constraint: a__U21(X) >= U21(X)
constraint: a__U32(tt) >= tt
constraint: a__U32(X) >= U32(X)
constraint: a__U31(tt,V2) >= a__U32(a__isNat(V2))
constraint: a__U31(X1,X2) >= U31(X1,X2)
constraint: mark(tt) >= tt
constraint: mark(s(X)) >= s(mark(X))
constraint: mark(0) >= 0
constraint: mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2))
constraint: mark(x(X1,X2)) >= a__x(mark(X1),mark(X2))
constraint: mark(U11(X1,X2)) >= a__U11(mark(X1),X2)
constraint: mark(U12(X)) >= a__U12(mark(X))
constraint: mark(isNat(X)) >= a__isNat(X)
constraint: mark(U21(X)) >= a__U21(mark(X))
constraint: mark(U31(X1,X2)) >= a__U31(mark(X1),X2)
constraint: mark(U32(X)) >= a__U32(mark(X))
constraint: mark(U41(X1,X2)) >= a__U41(mark(X1),X2)
constraint: mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3)
constraint: mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3)
constraint: mark(U61(X)) >= a__U61(mark(X))
constraint: mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3)
constraint: mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3)
constraint: a__U41(tt,N) >= mark(N)
constraint: a__U41(X1,X2) >= U41(X1,X2)
constraint: a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M)))
constraint: a__U52(X1,X2,X3) >= U52(X1,X2,X3)
constraint: a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N)
constraint: a__U51(X1,X2,X3) >= U51(X1,X2,X3)
constraint: a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N)
constraint: a__plus(N,0) >= a__U41(a__isNat(N),N)
constraint: a__plus(X1,X2) >= plus(X1,X2)
constraint: a__U61(tt) >= 0
constraint: a__U61(X) >= U61(X)
constraint: a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N))
constraint: a__U72(X1,X2,X3) >= U72(X1,X2,X3)
constraint: a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N)
constraint: a__U71(X1,X2,X3) >= U71(X1,X2,X3)
constraint: a__x(N,s(M)) >= a__U71(a__isNat(M),M,N)
constraint: a__x(N,0) >= a__U61(a__isNat(N))
constraint: a__x(X1,X2) >= x(X1,X2)
constraint: Marked_a__U31(tt,V2) >= Marked_a__isNat(V2)
constraint: Marked_a__isNat(s(V1)) >= Marked_a__isNat(V1)
constraint: Marked_a__isNat(plus(V1,V2)) >= Marked_a__isNat(V1)
constraint: Marked_a__isNat(plus(V1,V2)) >= Marked_a__U11(a__isNat(V1),V2)
constraint: Marked_a__isNat(x(V1,V2)) >= Marked_a__U31(a__isNat(V1),V2)
constraint: Marked_a__isNat(x(V1,V2)) >= Marked_a__isNat(V1)
constraint: Marked_a__U11(tt,V2) >= Marked_a__isNat(V2)
APPLY CRITERIA (Graph splitting)
Found 1 components:

{  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
      --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(N)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(M)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(N)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_a__plus(a__x(mark(N),mark(M)),mark(N))>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)> 
     --> <Marked_a__U71(tt,M,N) , Marked_a__U72(a__isNat(N),M,N)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))> 
     --> <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)> 
     --> <Marked_a__U41(tt,N) , Marked_mark(N)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)> 
     --> <Marked_a__U41(tt,N) , Marked_mark(N)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_a__plus(a__x(mark(N),mark(M)),mark(N))> 
     --> <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)>
  <Marked_a__U71(tt,M,N) , Marked_a__U72(a__isNat(N),M,N)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(N)>
  <Marked_a__U71(tt,M,N) , Marked_a__U72(a__isNat(N),M,N)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(M)>
  <Marked_a__U71(tt,M,N) , Marked_a__U72(a__isNat(N),M,N)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(N)>
  <Marked_a__U71(tt,M,N) , Marked_a__U72(a__isNat(N),M,N)> 
     --> <Marked_a__U72(tt,M,N) , Marked_a__plus(a__x(mark(N),mark(M)),mark(N))>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U71(X1,X2,X3)) , Marked_a__U71(mark(X1),X2,X3)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
}
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_a__U72(tt,M,N) >= Marked_a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  Marked_a__U72(tt,M,N) >= Marked_mark(N) ;
  Marked_a__U72(tt,M,N) >= Marked_mark(M) ;
  Marked_a__U71(tt,M,N) >= Marked_a__U72(a__isNat(N),M,N) ;
  Marked_a__plus(N,0) >= Marked_a__U41(a__isNat(N),N) ;
  Marked_a__U41(tt,N) >= Marked_mark(N) ;
  Marked_mark(plus(X1,X2)) >= Marked_a__plus(mark(X1),mark(X2)) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X2) ;
  Marked_mark(x(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(x(X1,X2)) >= Marked_mark(X2) ;
  Marked_mark(U11(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U12(X)) >= Marked_mark(X) ;
  Marked_mark(U21(X)) >= Marked_mark(X) ;
  Marked_mark(U31(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U32(X)) >= Marked_mark(X) ;
  Marked_mark(U41(X1,X2)) >= Marked_a__U41(mark(X1),X2) ;
  Marked_mark(U41(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U61(X)) >= Marked_mark(X) ;
  Marked_mark(U71(X1,X2,X3)) >= Marked_a__U71(mark(X1),X2,X3) ;
  Marked_mark(U71(X1,X2,X3)) >= Marked_mark(X1) ;
  Marked_mark(U72(X1,X2,X3)) >= Marked_a__U72(mark(X1),X2,X3) ;
  Marked_mark(U72(X1,X2,X3)) >= Marked_mark(X1) ;
 }
 + Disjunctions:{ 
{
  Marked_a__U72(tt,M,N) > Marked_a__plus(a__x(mark(N),mark(M)),mark(N)) ;
 }
{
  Marked_a__U72(tt,M,N) > Marked_mark(N) ;
 }
{
  Marked_a__U72(tt,M,N) > Marked_mark(M) ;
 }
{
  Marked_a__U71(tt,M,N) > Marked_a__U72(a__isNat(N),M,N) ;
 }
{
  Marked_a__plus(N,0) > Marked_a__U41(a__isNat(N),N) ;
 }
{
  Marked_a__U41(tt,N) > Marked_mark(N) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_a__plus(mark(X1),mark(X2)) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X2) ;
 }
{
  Marked_mark(x(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(x(X1,X2)) > Marked_mark(X2) ;
 }
{
  Marked_mark(U11(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U12(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U21(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U31(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U32(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U41(X1,X2)) > Marked_a__U41(mark(X1),X2) ;
 }
{
  Marked_mark(U41(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U61(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U71(X1,X2,X3)) > Marked_a__U71(mark(X1),X2,X3) ;
 }
{
  Marked_mark(U71(X1,X2,X3)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U72(X1,X2,X3)) > Marked_a__U72(mark(X1),X2,X3) ;
 }
{
  Marked_mark(U72(X1,X2,X3)) > Marked_mark(X1) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
No solution found for these parameters.
Entering rpo_solver
=== TIMER virtual : 25.000000 ===
Search parameters: AFS type: 2 ; time limit: 25.. 
=== STOPING TIMER virtual ===
Time out for these parameters.
=== TIMER virtual : 15.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 15.000000 ===
=== STOPING TIMER real ===
Sat solver returned
Sat solver result read
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
constraint: a__U12(tt) >= tt
constraint: a__U12(X) >= U12(X)
constraint: a__isNat(s(V1)) >= a__U21(a__isNat(V1))
constraint: a__isNat(0) >= tt
constraint: a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2)
constraint: a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2)
constraint: a__isNat(X) >= isNat(X)
constraint: a__U11(tt,V2) >= a__U12(a__isNat(V2))
constraint: a__U11(X1,X2) >= U11(X1,X2)
constraint: a__U21(tt) >= tt
constraint: a__U21(X) >= U21(X)
constraint: a__U32(tt) >= tt
constraint: a__U32(X) >= U32(X)
constraint: a__U31(tt,V2) >= a__U32(a__isNat(V2))
constraint: a__U31(X1,X2) >= U31(X1,X2)
constraint: mark(tt) >= tt
constraint: mark(s(X)) >= s(mark(X))
constraint: mark(0) >= 0
constraint: mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2))
constraint: mark(x(X1,X2)) >= a__x(mark(X1),mark(X2))
constraint: mark(U11(X1,X2)) >= a__U11(mark(X1),X2)
constraint: mark(U12(X)) >= a__U12(mark(X))
constraint: mark(isNat(X)) >= a__isNat(X)
constraint: mark(U21(X)) >= a__U21(mark(X))
constraint: mark(U31(X1,X2)) >= a__U31(mark(X1),X2)
constraint: mark(U32(X)) >= a__U32(mark(X))
constraint: mark(U41(X1,X2)) >= a__U41(mark(X1),X2)
constraint: mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3)
constraint: mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3)
constraint: mark(U61(X)) >= a__U61(mark(X))
constraint: mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3)
constraint: mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3)
constraint: a__U41(tt,N) >= mark(N)
constraint: a__U41(X1,X2) >= U41(X1,X2)
constraint: a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M)))
constraint: a__U52(X1,X2,X3) >= U52(X1,X2,X3)
constraint: a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N)
constraint: a__U51(X1,X2,X3) >= U51(X1,X2,X3)
constraint: a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N)
constraint: a__plus(N,0) >= a__U41(a__isNat(N),N)
constraint: a__plus(X1,X2) >= plus(X1,X2)
constraint: a__U61(tt) >= 0
constraint: a__U61(X) >= U61(X)
constraint: a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N))
constraint: a__U72(X1,X2,X3) >= U72(X1,X2,X3)
constraint: a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N)
constraint: a__U71(X1,X2,X3) >= U71(X1,X2,X3)
constraint: a__x(N,s(M)) >= a__U71(a__isNat(M),M,N)
constraint: a__x(N,0) >= a__U61(a__isNat(N))
constraint: a__x(X1,X2) >= x(X1,X2)
constraint: Marked_a__U72(tt,M,N) >= Marked_a__plus(a__x(mark(N),mark(M)),
                                      mark(N))
constraint: Marked_a__U72(tt,M,N) >= Marked_mark(N)
constraint: Marked_a__U72(tt,M,N) >= Marked_mark(M)
constraint: Marked_a__U71(tt,M,N) >= Marked_a__U72(a__isNat(N),M,N)
constraint: Marked_a__plus(N,0) >= Marked_a__U41(a__isNat(N),N)
constraint: Marked_a__U41(tt,N) >= Marked_mark(N)
constraint: Marked_mark(plus(X1,X2)) >= Marked_a__plus(mark(X1),mark(X2))
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X2)
constraint: Marked_mark(x(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(x(X1,X2)) >= Marked_mark(X2)
constraint: Marked_mark(U11(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U12(X)) >= Marked_mark(X)
constraint: Marked_mark(U21(X)) >= Marked_mark(X)
constraint: Marked_mark(U31(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U32(X)) >= Marked_mark(X)
constraint: Marked_mark(U41(X1,X2)) >= Marked_a__U41(mark(X1),X2)
constraint: Marked_mark(U41(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U61(X)) >= Marked_mark(X)
constraint: Marked_mark(U71(X1,X2,X3)) >= Marked_a__U71(mark(X1),X2,X3)
constraint: Marked_mark(U71(X1,X2,X3)) >= Marked_mark(X1)
constraint: Marked_mark(U72(X1,X2,X3)) >= Marked_a__U72(mark(X1),X2,X3)
constraint: Marked_mark(U72(X1,X2,X3)) >= Marked_mark(X1)
APPLY CRITERIA (Graph splitting)
Found 1 components:

{  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
      --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(N)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(M)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(N)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_a__plus(a__x(mark(N),mark(M)),mark(N))>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U61(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))> 
     --> <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U41(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)> 
     --> <Marked_a__U41(tt,N) , Marked_mark(N)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)> 
     --> <Marked_a__U41(tt,N) , Marked_mark(N)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_a__plus(a__x(mark(N),mark(M)),mark(N))> 
     --> <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U61(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U41(X1,X2)) , Marked_a__U41(mark(X1),X2)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
}
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_a__U72(tt,M,N) >= Marked_a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  Marked_a__U72(tt,M,N) >= Marked_mark(N) ;
  Marked_a__U72(tt,M,N) >= Marked_mark(M) ;
  Marked_a__plus(N,0) >= Marked_a__U41(a__isNat(N),N) ;
  Marked_a__U41(tt,N) >= Marked_mark(N) ;
  Marked_mark(plus(X1,X2)) >= Marked_a__plus(mark(X1),mark(X2)) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X2) ;
  Marked_mark(x(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(x(X1,X2)) >= Marked_mark(X2) ;
  Marked_mark(U11(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U12(X)) >= Marked_mark(X) ;
  Marked_mark(U21(X)) >= Marked_mark(X) ;
  Marked_mark(U31(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U32(X)) >= Marked_mark(X) ;
  Marked_mark(U41(X1,X2)) >= Marked_a__U41(mark(X1),X2) ;
  Marked_mark(U41(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U61(X)) >= Marked_mark(X) ;
  Marked_mark(U72(X1,X2,X3)) >= Marked_a__U72(mark(X1),X2,X3) ;
  Marked_mark(U72(X1,X2,X3)) >= Marked_mark(X1) ;
 }
 + Disjunctions:{ 
{
  Marked_a__U72(tt,M,N) > Marked_a__plus(a__x(mark(N),mark(M)),mark(N)) ;
 }
{
  Marked_a__U72(tt,M,N) > Marked_mark(N) ;
 }
{
  Marked_a__U72(tt,M,N) > Marked_mark(M) ;
 }
{
  Marked_a__plus(N,0) > Marked_a__U41(a__isNat(N),N) ;
 }
{
  Marked_a__U41(tt,N) > Marked_mark(N) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_a__plus(mark(X1),mark(X2)) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X2) ;
 }
{
  Marked_mark(x(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(x(X1,X2)) > Marked_mark(X2) ;
 }
{
  Marked_mark(U11(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U12(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U21(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U31(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U32(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U41(X1,X2)) > Marked_a__U41(mark(X1),X2) ;
 }
{
  Marked_mark(U41(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U61(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U72(X1,X2,X3)) > Marked_a__U72(mark(X1),X2,X3) ;
 }
{
  Marked_mark(U72(X1,X2,X3)) > Marked_mark(X1) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
No solution found for these parameters.
Entering rpo_solver
=== TIMER virtual : 25.000000 ===
Search parameters: AFS type: 2 ; time limit: 25.. 
=== STOPING TIMER virtual ===
Time out for these parameters.
=== TIMER virtual : 15.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 15.000000 ===
=== STOPING TIMER real ===
Sat solver returned
Sat solver result read
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
constraint: a__U12(tt) >= tt
constraint: a__U12(X) >= U12(X)
constraint: a__isNat(s(V1)) >= a__U21(a__isNat(V1))
constraint: a__isNat(0) >= tt
constraint: a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2)
constraint: a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2)
constraint: a__isNat(X) >= isNat(X)
constraint: a__U11(tt,V2) >= a__U12(a__isNat(V2))
constraint: a__U11(X1,X2) >= U11(X1,X2)
constraint: a__U21(tt) >= tt
constraint: a__U21(X) >= U21(X)
constraint: a__U32(tt) >= tt
constraint: a__U32(X) >= U32(X)
constraint: a__U31(tt,V2) >= a__U32(a__isNat(V2))
constraint: a__U31(X1,X2) >= U31(X1,X2)
constraint: mark(tt) >= tt
constraint: mark(s(X)) >= s(mark(X))
constraint: mark(0) >= 0
constraint: mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2))
constraint: mark(x(X1,X2)) >= a__x(mark(X1),mark(X2))
constraint: mark(U11(X1,X2)) >= a__U11(mark(X1),X2)
constraint: mark(U12(X)) >= a__U12(mark(X))
constraint: mark(isNat(X)) >= a__isNat(X)
constraint: mark(U21(X)) >= a__U21(mark(X))
constraint: mark(U31(X1,X2)) >= a__U31(mark(X1),X2)
constraint: mark(U32(X)) >= a__U32(mark(X))
constraint: mark(U41(X1,X2)) >= a__U41(mark(X1),X2)
constraint: mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3)
constraint: mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3)
constraint: mark(U61(X)) >= a__U61(mark(X))
constraint: mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3)
constraint: mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3)
constraint: a__U41(tt,N) >= mark(N)
constraint: a__U41(X1,X2) >= U41(X1,X2)
constraint: a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M)))
constraint: a__U52(X1,X2,X3) >= U52(X1,X2,X3)
constraint: a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N)
constraint: a__U51(X1,X2,X3) >= U51(X1,X2,X3)
constraint: a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N)
constraint: a__plus(N,0) >= a__U41(a__isNat(N),N)
constraint: a__plus(X1,X2) >= plus(X1,X2)
constraint: a__U61(tt) >= 0
constraint: a__U61(X) >= U61(X)
constraint: a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N))
constraint: a__U72(X1,X2,X3) >= U72(X1,X2,X3)
constraint: a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N)
constraint: a__U71(X1,X2,X3) >= U71(X1,X2,X3)
constraint: a__x(N,s(M)) >= a__U71(a__isNat(M),M,N)
constraint: a__x(N,0) >= a__U61(a__isNat(N))
constraint: a__x(X1,X2) >= x(X1,X2)
constraint: Marked_a__U72(tt,M,N) >= Marked_a__plus(a__x(mark(N),mark(M)),
                                      mark(N))
constraint: Marked_a__U72(tt,M,N) >= Marked_mark(N)
constraint: Marked_a__U72(tt,M,N) >= Marked_mark(M)
constraint: Marked_a__plus(N,0) >= Marked_a__U41(a__isNat(N),N)
constraint: Marked_a__U41(tt,N) >= Marked_mark(N)
constraint: Marked_mark(plus(X1,X2)) >= Marked_a__plus(mark(X1),mark(X2))
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X2)
constraint: Marked_mark(x(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(x(X1,X2)) >= Marked_mark(X2)
constraint: Marked_mark(U11(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U12(X)) >= Marked_mark(X)
constraint: Marked_mark(U21(X)) >= Marked_mark(X)
constraint: Marked_mark(U31(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U32(X)) >= Marked_mark(X)
constraint: Marked_mark(U41(X1,X2)) >= Marked_a__U41(mark(X1),X2)
constraint: Marked_mark(U41(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U61(X)) >= Marked_mark(X)
constraint: Marked_mark(U72(X1,X2,X3)) >= Marked_a__U72(mark(X1),X2,X3)
constraint: Marked_mark(U72(X1,X2,X3)) >= Marked_mark(X1)
APPLY CRITERIA (Graph splitting)
Found 1 components:

{  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
      --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(N)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(M)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_mark(N)>
  <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)> 
     --> <Marked_a__U72(tt,M,N) , Marked_a__plus(a__x(mark(N),mark(M)),mark(N))>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))> 
     --> <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)> 
     --> <Marked_a__U41(tt,N) , Marked_mark(N)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(M)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U72(tt,M,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U72(tt,M,N) , Marked_a__plus(a__x(mark(N),mark(M)),mark(N))> 
     --> <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U72(X1,X2,X3)) , Marked_a__U72(mark(X1),X2,X3)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
}
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_a__U72(tt,M,N) >= Marked_a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  Marked_a__U72(tt,M,N) >= Marked_mark(N) ;
  Marked_a__U72(tt,M,N) >= Marked_mark(M) ;
  Marked_a__plus(N,0) >= Marked_a__U41(a__isNat(N),N) ;
  Marked_a__U41(tt,N) >= Marked_mark(N) ;
  Marked_mark(plus(X1,X2)) >= Marked_a__plus(mark(X1),mark(X2)) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X2) ;
  Marked_mark(x(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(x(X1,X2)) >= Marked_mark(X2) ;
  Marked_mark(U11(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U12(X)) >= Marked_mark(X) ;
  Marked_mark(U21(X)) >= Marked_mark(X) ;
  Marked_mark(U31(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U32(X)) >= Marked_mark(X) ;
  Marked_mark(U72(X1,X2,X3)) >= Marked_a__U72(mark(X1),X2,X3) ;
  Marked_mark(U72(X1,X2,X3)) >= Marked_mark(X1) ;
 }
 + Disjunctions:{ 
{
  Marked_a__U72(tt,M,N) > Marked_a__plus(a__x(mark(N),mark(M)),mark(N)) ;
 }
{
  Marked_a__U72(tt,M,N) > Marked_mark(N) ;
 }
{
  Marked_a__U72(tt,M,N) > Marked_mark(M) ;
 }
{
  Marked_a__plus(N,0) > Marked_a__U41(a__isNat(N),N) ;
 }
{
  Marked_a__U41(tt,N) > Marked_mark(N) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_a__plus(mark(X1),mark(X2)) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X2) ;
 }
{
  Marked_mark(x(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(x(X1,X2)) > Marked_mark(X2) ;
 }
{
  Marked_mark(U11(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U12(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U21(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U31(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U32(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U72(X1,X2,X3)) > Marked_a__U72(mark(X1),X2,X3) ;
 }
{
  Marked_mark(U72(X1,X2,X3)) > Marked_mark(X1) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
No solution found for these parameters.
Entering rpo_solver
=== TIMER virtual : 25.000000 ===
Search parameters: AFS type: 2 ; time limit: 25.. 
=== STOPING TIMER virtual ===
Time out for these parameters.
=== TIMER virtual : 15.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 15.000000 ===
=== STOPING TIMER real ===
Sat solver returned
Sat solver result read
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
constraint: a__U12(tt) >= tt
constraint: a__U12(X) >= U12(X)
constraint: a__isNat(s(V1)) >= a__U21(a__isNat(V1))
constraint: a__isNat(0) >= tt
constraint: a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2)
constraint: a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2)
constraint: a__isNat(X) >= isNat(X)
constraint: a__U11(tt,V2) >= a__U12(a__isNat(V2))
constraint: a__U11(X1,X2) >= U11(X1,X2)
constraint: a__U21(tt) >= tt
constraint: a__U21(X) >= U21(X)
constraint: a__U32(tt) >= tt
constraint: a__U32(X) >= U32(X)
constraint: a__U31(tt,V2) >= a__U32(a__isNat(V2))
constraint: a__U31(X1,X2) >= U31(X1,X2)
constraint: mark(tt) >= tt
constraint: mark(s(X)) >= s(mark(X))
constraint: mark(0) >= 0
constraint: mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2))
constraint: mark(x(X1,X2)) >= a__x(mark(X1),mark(X2))
constraint: mark(U11(X1,X2)) >= a__U11(mark(X1),X2)
constraint: mark(U12(X)) >= a__U12(mark(X))
constraint: mark(isNat(X)) >= a__isNat(X)
constraint: mark(U21(X)) >= a__U21(mark(X))
constraint: mark(U31(X1,X2)) >= a__U31(mark(X1),X2)
constraint: mark(U32(X)) >= a__U32(mark(X))
constraint: mark(U41(X1,X2)) >= a__U41(mark(X1),X2)
constraint: mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3)
constraint: mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3)
constraint: mark(U61(X)) >= a__U61(mark(X))
constraint: mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3)
constraint: mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3)
constraint: a__U41(tt,N) >= mark(N)
constraint: a__U41(X1,X2) >= U41(X1,X2)
constraint: a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M)))
constraint: a__U52(X1,X2,X3) >= U52(X1,X2,X3)
constraint: a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N)
constraint: a__U51(X1,X2,X3) >= U51(X1,X2,X3)
constraint: a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N)
constraint: a__plus(N,0) >= a__U41(a__isNat(N),N)
constraint: a__plus(X1,X2) >= plus(X1,X2)
constraint: a__U61(tt) >= 0
constraint: a__U61(X) >= U61(X)
constraint: a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N))
constraint: a__U72(X1,X2,X3) >= U72(X1,X2,X3)
constraint: a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N)
constraint: a__U71(X1,X2,X3) >= U71(X1,X2,X3)
constraint: a__x(N,s(M)) >= a__U71(a__isNat(M),M,N)
constraint: a__x(N,0) >= a__U61(a__isNat(N))
constraint: a__x(X1,X2) >= x(X1,X2)
constraint: Marked_a__U72(tt,M,N) >= Marked_a__plus(a__x(mark(N),mark(M)),
                                      mark(N))
constraint: Marked_a__U72(tt,M,N) >= Marked_mark(N)
constraint: Marked_a__U72(tt,M,N) >= Marked_mark(M)
constraint: Marked_a__plus(N,0) >= Marked_a__U41(a__isNat(N),N)
constraint: Marked_a__U41(tt,N) >= Marked_mark(N)
constraint: Marked_mark(plus(X1,X2)) >= Marked_a__plus(mark(X1),mark(X2))
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X2)
constraint: Marked_mark(x(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(x(X1,X2)) >= Marked_mark(X2)
constraint: Marked_mark(U11(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U12(X)) >= Marked_mark(X)
constraint: Marked_mark(U21(X)) >= Marked_mark(X)
constraint: Marked_mark(U31(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U32(X)) >= Marked_mark(X)
constraint: Marked_mark(U72(X1,X2,X3)) >= Marked_a__U72(mark(X1),X2,X3)
constraint: Marked_mark(U72(X1,X2,X3)) >= Marked_mark(X1)
APPLY CRITERIA (Graph splitting)
Found 1 components:

{  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
      --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))> 
     --> <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_a__plus(N,0) , Marked_a__U41(a__isNat(N),N)> 
     --> <Marked_a__U41(tt,N) , Marked_mark(N)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_a__plus(mark(X1),mark(X2))>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_a__U41(tt,N) , Marked_mark(N)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
}
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_a__plus(N,0) >= Marked_a__U41(a__isNat(N),N) ;
  Marked_a__U41(tt,N) >= Marked_mark(N) ;
  Marked_mark(plus(X1,X2)) >= Marked_a__plus(mark(X1),mark(X2)) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X2) ;
  Marked_mark(x(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(x(X1,X2)) >= Marked_mark(X2) ;
  Marked_mark(U11(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U12(X)) >= Marked_mark(X) ;
  Marked_mark(U21(X)) >= Marked_mark(X) ;
  Marked_mark(U31(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U32(X)) >= Marked_mark(X) ;
 }
 + Disjunctions:{ 
{
  Marked_a__plus(N,0) > Marked_a__U41(a__isNat(N),N) ;
 }
{
  Marked_a__U41(tt,N) > Marked_mark(N) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_a__plus(mark(X1),mark(X2)) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X2) ;
 }
{
  Marked_mark(x(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(x(X1,X2)) > Marked_mark(X2) ;
 }
{
  Marked_mark(U11(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U12(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U21(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U31(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U32(X)) > Marked_mark(X) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
No solution found for these parameters.
Entering rpo_solver
=== TIMER virtual : 25.000000 ===
Search parameters: AFS type: 2 ; time limit: 25.. 
=== STOPING TIMER virtual ===
Time out for these parameters.
=== TIMER virtual : 15.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 15.000000 ===
=== STOPING TIMER real ===
Sat solver returned
Sat solver result read
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
constraint: a__U12(tt) >= tt
constraint: a__U12(X) >= U12(X)
constraint: a__isNat(s(V1)) >= a__U21(a__isNat(V1))
constraint: a__isNat(0) >= tt
constraint: a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2)
constraint: a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2)
constraint: a__isNat(X) >= isNat(X)
constraint: a__U11(tt,V2) >= a__U12(a__isNat(V2))
constraint: a__U11(X1,X2) >= U11(X1,X2)
constraint: a__U21(tt) >= tt
constraint: a__U21(X) >= U21(X)
constraint: a__U32(tt) >= tt
constraint: a__U32(X) >= U32(X)
constraint: a__U31(tt,V2) >= a__U32(a__isNat(V2))
constraint: a__U31(X1,X2) >= U31(X1,X2)
constraint: mark(tt) >= tt
constraint: mark(s(X)) >= s(mark(X))
constraint: mark(0) >= 0
constraint: mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2))
constraint: mark(x(X1,X2)) >= a__x(mark(X1),mark(X2))
constraint: mark(U11(X1,X2)) >= a__U11(mark(X1),X2)
constraint: mark(U12(X)) >= a__U12(mark(X))
constraint: mark(isNat(X)) >= a__isNat(X)
constraint: mark(U21(X)) >= a__U21(mark(X))
constraint: mark(U31(X1,X2)) >= a__U31(mark(X1),X2)
constraint: mark(U32(X)) >= a__U32(mark(X))
constraint: mark(U41(X1,X2)) >= a__U41(mark(X1),X2)
constraint: mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3)
constraint: mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3)
constraint: mark(U61(X)) >= a__U61(mark(X))
constraint: mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3)
constraint: mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3)
constraint: a__U41(tt,N) >= mark(N)
constraint: a__U41(X1,X2) >= U41(X1,X2)
constraint: a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M)))
constraint: a__U52(X1,X2,X3) >= U52(X1,X2,X3)
constraint: a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N)
constraint: a__U51(X1,X2,X3) >= U51(X1,X2,X3)
constraint: a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N)
constraint: a__plus(N,0) >= a__U41(a__isNat(N),N)
constraint: a__plus(X1,X2) >= plus(X1,X2)
constraint: a__U61(tt) >= 0
constraint: a__U61(X) >= U61(X)
constraint: a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N))
constraint: a__U72(X1,X2,X3) >= U72(X1,X2,X3)
constraint: a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N)
constraint: a__U71(X1,X2,X3) >= U71(X1,X2,X3)
constraint: a__x(N,s(M)) >= a__U71(a__isNat(M),M,N)
constraint: a__x(N,0) >= a__U61(a__isNat(N))
constraint: a__x(X1,X2) >= x(X1,X2)
constraint: Marked_a__plus(N,0) >= Marked_a__U41(a__isNat(N),N)
constraint: Marked_a__U41(tt,N) >= Marked_mark(N)
constraint: Marked_mark(plus(X1,X2)) >= Marked_a__plus(mark(X1),mark(X2))
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X2)
constraint: Marked_mark(x(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(x(X1,X2)) >= Marked_mark(X2)
constraint: Marked_mark(U11(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U12(X)) >= Marked_mark(X)
constraint: Marked_mark(U21(X)) >= Marked_mark(X)
constraint: Marked_mark(U31(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U32(X)) >= Marked_mark(X)
APPLY CRITERIA (Graph splitting)
Found 1 components:

{  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
      --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(x(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(x(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
}
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X2) ;
  Marked_mark(x(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(x(X1,X2)) >= Marked_mark(X2) ;
  Marked_mark(U11(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U12(X)) >= Marked_mark(X) ;
  Marked_mark(U21(X)) >= Marked_mark(X) ;
  Marked_mark(U31(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U32(X)) >= Marked_mark(X) ;
 }
 + Disjunctions:{ 
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X2) ;
 }
{
  Marked_mark(x(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(x(X1,X2)) > Marked_mark(X2) ;
 }
{
  Marked_mark(U11(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U12(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U21(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U31(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U32(X)) > Marked_mark(X) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
No solution found for these parameters.
Entering rpo_solver
=== TIMER virtual : 25.000000 ===
Search parameters: AFS type: 2 ; time limit: 25.. 
=== STOPING TIMER virtual ===
Time out for these parameters.
=== TIMER virtual : 15.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 15.000000 ===
=== STOPING TIMER real ===
Sat solver returned
Sat solver result read
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
constraint: a__U12(tt) >= tt
constraint: a__U12(X) >= U12(X)
constraint: a__isNat(s(V1)) >= a__U21(a__isNat(V1))
constraint: a__isNat(0) >= tt
constraint: a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2)
constraint: a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2)
constraint: a__isNat(X) >= isNat(X)
constraint: a__U11(tt,V2) >= a__U12(a__isNat(V2))
constraint: a__U11(X1,X2) >= U11(X1,X2)
constraint: a__U21(tt) >= tt
constraint: a__U21(X) >= U21(X)
constraint: a__U32(tt) >= tt
constraint: a__U32(X) >= U32(X)
constraint: a__U31(tt,V2) >= a__U32(a__isNat(V2))
constraint: a__U31(X1,X2) >= U31(X1,X2)
constraint: mark(tt) >= tt
constraint: mark(s(X)) >= s(mark(X))
constraint: mark(0) >= 0
constraint: mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2))
constraint: mark(x(X1,X2)) >= a__x(mark(X1),mark(X2))
constraint: mark(U11(X1,X2)) >= a__U11(mark(X1),X2)
constraint: mark(U12(X)) >= a__U12(mark(X))
constraint: mark(isNat(X)) >= a__isNat(X)
constraint: mark(U21(X)) >= a__U21(mark(X))
constraint: mark(U31(X1,X2)) >= a__U31(mark(X1),X2)
constraint: mark(U32(X)) >= a__U32(mark(X))
constraint: mark(U41(X1,X2)) >= a__U41(mark(X1),X2)
constraint: mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3)
constraint: mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3)
constraint: mark(U61(X)) >= a__U61(mark(X))
constraint: mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3)
constraint: mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3)
constraint: a__U41(tt,N) >= mark(N)
constraint: a__U41(X1,X2) >= U41(X1,X2)
constraint: a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M)))
constraint: a__U52(X1,X2,X3) >= U52(X1,X2,X3)
constraint: a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N)
constraint: a__U51(X1,X2,X3) >= U51(X1,X2,X3)
constraint: a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N)
constraint: a__plus(N,0) >= a__U41(a__isNat(N),N)
constraint: a__plus(X1,X2) >= plus(X1,X2)
constraint: a__U61(tt) >= 0
constraint: a__U61(X) >= U61(X)
constraint: a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N))
constraint: a__U72(X1,X2,X3) >= U72(X1,X2,X3)
constraint: a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N)
constraint: a__U71(X1,X2,X3) >= U71(X1,X2,X3)
constraint: a__x(N,s(M)) >= a__U71(a__isNat(M),M,N)
constraint: a__x(N,0) >= a__U61(a__isNat(N))
constraint: a__x(X1,X2) >= x(X1,X2)
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X2)
constraint: Marked_mark(x(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(x(X1,X2)) >= Marked_mark(X2)
constraint: Marked_mark(U11(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U12(X)) >= Marked_mark(X)
constraint: Marked_mark(U21(X)) >= Marked_mark(X)
constraint: Marked_mark(U31(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U32(X)) >= Marked_mark(X)
APPLY CRITERIA (Graph splitting)
Found 1 components:

{  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
      --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X2)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(plus(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X2)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(plus(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
}
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(plus(X1,X2)) >= Marked_mark(X2) ;
  Marked_mark(U11(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U12(X)) >= Marked_mark(X) ;
  Marked_mark(U21(X)) >= Marked_mark(X) ;
  Marked_mark(U31(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U32(X)) >= Marked_mark(X) ;
 }
 + Disjunctions:{ 
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(plus(X1,X2)) > Marked_mark(X2) ;
 }
{
  Marked_mark(U11(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U12(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U21(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U31(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U32(X)) > Marked_mark(X) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
No solution found for these parameters.
Entering rpo_solver
=== TIMER virtual : 25.000000 ===
Search parameters: AFS type: 2 ; time limit: 25.. 
=== STOPING TIMER virtual ===
Time out for these parameters.
=== TIMER virtual : 15.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 15.000000 ===
=== STOPING TIMER real ===
Sat solver returned
Sat solver result read
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
constraint: a__U12(tt) >= tt
constraint: a__U12(X) >= U12(X)
constraint: a__isNat(s(V1)) >= a__U21(a__isNat(V1))
constraint: a__isNat(0) >= tt
constraint: a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2)
constraint: a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2)
constraint: a__isNat(X) >= isNat(X)
constraint: a__U11(tt,V2) >= a__U12(a__isNat(V2))
constraint: a__U11(X1,X2) >= U11(X1,X2)
constraint: a__U21(tt) >= tt
constraint: a__U21(X) >= U21(X)
constraint: a__U32(tt) >= tt
constraint: a__U32(X) >= U32(X)
constraint: a__U31(tt,V2) >= a__U32(a__isNat(V2))
constraint: a__U31(X1,X2) >= U31(X1,X2)
constraint: mark(tt) >= tt
constraint: mark(s(X)) >= s(mark(X))
constraint: mark(0) >= 0
constraint: mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2))
constraint: mark(x(X1,X2)) >= a__x(mark(X1),mark(X2))
constraint: mark(U11(X1,X2)) >= a__U11(mark(X1),X2)
constraint: mark(U12(X)) >= a__U12(mark(X))
constraint: mark(isNat(X)) >= a__isNat(X)
constraint: mark(U21(X)) >= a__U21(mark(X))
constraint: mark(U31(X1,X2)) >= a__U31(mark(X1),X2)
constraint: mark(U32(X)) >= a__U32(mark(X))
constraint: mark(U41(X1,X2)) >= a__U41(mark(X1),X2)
constraint: mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3)
constraint: mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3)
constraint: mark(U61(X)) >= a__U61(mark(X))
constraint: mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3)
constraint: mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3)
constraint: a__U41(tt,N) >= mark(N)
constraint: a__U41(X1,X2) >= U41(X1,X2)
constraint: a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M)))
constraint: a__U52(X1,X2,X3) >= U52(X1,X2,X3)
constraint: a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N)
constraint: a__U51(X1,X2,X3) >= U51(X1,X2,X3)
constraint: a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N)
constraint: a__plus(N,0) >= a__U41(a__isNat(N),N)
constraint: a__plus(X1,X2) >= plus(X1,X2)
constraint: a__U61(tt) >= 0
constraint: a__U61(X) >= U61(X)
constraint: a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N))
constraint: a__U72(X1,X2,X3) >= U72(X1,X2,X3)
constraint: a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N)
constraint: a__U71(X1,X2,X3) >= U71(X1,X2,X3)
constraint: a__x(N,s(M)) >= a__U71(a__isNat(M),M,N)
constraint: a__x(N,0) >= a__U61(a__isNat(N))
constraint: a__x(X1,X2) >= x(X1,X2)
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(plus(X1,X2)) >= Marked_mark(X2)
constraint: Marked_mark(U11(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U12(X)) >= Marked_mark(X)
constraint: Marked_mark(U21(X)) >= Marked_mark(X)
constraint: Marked_mark(U31(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U32(X)) >= Marked_mark(X)
APPLY CRITERIA (Graph splitting)
Found 1 components:

{  <Marked_mark(U32(X)) , Marked_mark(X)> 
      --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U21(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U21(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
}
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_mark(U11(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U12(X)) >= Marked_mark(X) ;
  Marked_mark(U21(X)) >= Marked_mark(X) ;
  Marked_mark(U31(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U32(X)) >= Marked_mark(X) ;
 }
 + Disjunctions:{ 
{
  Marked_mark(U11(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U12(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U21(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U31(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U32(X)) > Marked_mark(X) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
No solution found for these parameters.
Entering rpo_solver
=== TIMER virtual : 25.000000 ===
Search parameters: AFS type: 2 ; time limit: 25.. 
=== STOPING TIMER virtual ===
Time out for these parameters.
=== TIMER virtual : 15.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 15.000000 ===
=== STOPING TIMER real ===
Sat solver returned
Sat solver result read
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
constraint: a__U12(tt) >= tt
constraint: a__U12(X) >= U12(X)
constraint: a__isNat(s(V1)) >= a__U21(a__isNat(V1))
constraint: a__isNat(0) >= tt
constraint: a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2)
constraint: a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2)
constraint: a__isNat(X) >= isNat(X)
constraint: a__U11(tt,V2) >= a__U12(a__isNat(V2))
constraint: a__U11(X1,X2) >= U11(X1,X2)
constraint: a__U21(tt) >= tt
constraint: a__U21(X) >= U21(X)
constraint: a__U32(tt) >= tt
constraint: a__U32(X) >= U32(X)
constraint: a__U31(tt,V2) >= a__U32(a__isNat(V2))
constraint: a__U31(X1,X2) >= U31(X1,X2)
constraint: mark(tt) >= tt
constraint: mark(s(X)) >= s(mark(X))
constraint: mark(0) >= 0
constraint: mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2))
constraint: mark(x(X1,X2)) >= a__x(mark(X1),mark(X2))
constraint: mark(U11(X1,X2)) >= a__U11(mark(X1),X2)
constraint: mark(U12(X)) >= a__U12(mark(X))
constraint: mark(isNat(X)) >= a__isNat(X)
constraint: mark(U21(X)) >= a__U21(mark(X))
constraint: mark(U31(X1,X2)) >= a__U31(mark(X1),X2)
constraint: mark(U32(X)) >= a__U32(mark(X))
constraint: mark(U41(X1,X2)) >= a__U41(mark(X1),X2)
constraint: mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3)
constraint: mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3)
constraint: mark(U61(X)) >= a__U61(mark(X))
constraint: mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3)
constraint: mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3)
constraint: a__U41(tt,N) >= mark(N)
constraint: a__U41(X1,X2) >= U41(X1,X2)
constraint: a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M)))
constraint: a__U52(X1,X2,X3) >= U52(X1,X2,X3)
constraint: a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N)
constraint: a__U51(X1,X2,X3) >= U51(X1,X2,X3)
constraint: a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N)
constraint: a__plus(N,0) >= a__U41(a__isNat(N),N)
constraint: a__plus(X1,X2) >= plus(X1,X2)
constraint: a__U61(tt) >= 0
constraint: a__U61(X) >= U61(X)
constraint: a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N))
constraint: a__U72(X1,X2,X3) >= U72(X1,X2,X3)
constraint: a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N)
constraint: a__U71(X1,X2,X3) >= U71(X1,X2,X3)
constraint: a__x(N,s(M)) >= a__U71(a__isNat(M),M,N)
constraint: a__x(N,0) >= a__U61(a__isNat(N))
constraint: a__x(X1,X2) >= x(X1,X2)
constraint: Marked_mark(U11(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U12(X)) >= Marked_mark(X)
constraint: Marked_mark(U21(X)) >= Marked_mark(X)
constraint: Marked_mark(U31(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U32(X)) >= Marked_mark(X)
APPLY CRITERIA (Graph splitting)
Found 1 components:

{  <Marked_mark(U32(X)) , Marked_mark(X)> 
      --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U12(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U12(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
}
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_mark(U11(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U12(X)) >= Marked_mark(X) ;
  Marked_mark(U31(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U32(X)) >= Marked_mark(X) ;
 }
 + Disjunctions:{ 
{
  Marked_mark(U11(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U12(X)) > Marked_mark(X) ;
 }
{
  Marked_mark(U31(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U32(X)) > Marked_mark(X) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
No solution found for these parameters.
Entering rpo_solver
=== TIMER virtual : 25.000000 ===
Search parameters: AFS type: 2 ; time limit: 25.. 
=== STOPING TIMER virtual ===
Time out for these parameters.
=== TIMER virtual : 15.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 15.000000 ===
=== STOPING TIMER real ===
Sat solver returned
Sat solver result read
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
constraint: a__U12(tt) >= tt
constraint: a__U12(X) >= U12(X)
constraint: a__isNat(s(V1)) >= a__U21(a__isNat(V1))
constraint: a__isNat(0) >= tt
constraint: a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2)
constraint: a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2)
constraint: a__isNat(X) >= isNat(X)
constraint: a__U11(tt,V2) >= a__U12(a__isNat(V2))
constraint: a__U11(X1,X2) >= U11(X1,X2)
constraint: a__U21(tt) >= tt
constraint: a__U21(X) >= U21(X)
constraint: a__U32(tt) >= tt
constraint: a__U32(X) >= U32(X)
constraint: a__U31(tt,V2) >= a__U32(a__isNat(V2))
constraint: a__U31(X1,X2) >= U31(X1,X2)
constraint: mark(tt) >= tt
constraint: mark(s(X)) >= s(mark(X))
constraint: mark(0) >= 0
constraint: mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2))
constraint: mark(x(X1,X2)) >= a__x(mark(X1),mark(X2))
constraint: mark(U11(X1,X2)) >= a__U11(mark(X1),X2)
constraint: mark(U12(X)) >= a__U12(mark(X))
constraint: mark(isNat(X)) >= a__isNat(X)
constraint: mark(U21(X)) >= a__U21(mark(X))
constraint: mark(U31(X1,X2)) >= a__U31(mark(X1),X2)
constraint: mark(U32(X)) >= a__U32(mark(X))
constraint: mark(U41(X1,X2)) >= a__U41(mark(X1),X2)
constraint: mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3)
constraint: mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3)
constraint: mark(U61(X)) >= a__U61(mark(X))
constraint: mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3)
constraint: mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3)
constraint: a__U41(tt,N) >= mark(N)
constraint: a__U41(X1,X2) >= U41(X1,X2)
constraint: a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M)))
constraint: a__U52(X1,X2,X3) >= U52(X1,X2,X3)
constraint: a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N)
constraint: a__U51(X1,X2,X3) >= U51(X1,X2,X3)
constraint: a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N)
constraint: a__plus(N,0) >= a__U41(a__isNat(N),N)
constraint: a__plus(X1,X2) >= plus(X1,X2)
constraint: a__U61(tt) >= 0
constraint: a__U61(X) >= U61(X)
constraint: a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N))
constraint: a__U72(X1,X2,X3) >= U72(X1,X2,X3)
constraint: a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N)
constraint: a__U71(X1,X2,X3) >= U71(X1,X2,X3)
constraint: a__x(N,s(M)) >= a__U71(a__isNat(M),M,N)
constraint: a__x(N,0) >= a__U61(a__isNat(N))
constraint: a__x(X1,X2) >= x(X1,X2)
constraint: Marked_mark(U11(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U12(X)) >= Marked_mark(X)
constraint: Marked_mark(U31(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U32(X)) >= Marked_mark(X)
APPLY CRITERIA (Graph splitting)
Found 1 components:

{  <Marked_mark(U32(X)) , Marked_mark(X)> 
      --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U31(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U31(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
}
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_mark(U11(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U31(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U32(X)) >= Marked_mark(X) ;
 }
 + Disjunctions:{ 
{
  Marked_mark(U11(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U31(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U32(X)) > Marked_mark(X) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
Sat solver result read
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
constraint: a__U12(tt) >= tt
constraint: a__U12(X) >= U12(X)
constraint: a__isNat(s(V1)) >= a__U21(a__isNat(V1))
constraint: a__isNat(0) >= tt
constraint: a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2)
constraint: a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2)
constraint: a__isNat(X) >= isNat(X)
constraint: a__U11(tt,V2) >= a__U12(a__isNat(V2))
constraint: a__U11(X1,X2) >= U11(X1,X2)
constraint: a__U21(tt) >= tt
constraint: a__U21(X) >= U21(X)
constraint: a__U32(tt) >= tt
constraint: a__U32(X) >= U32(X)
constraint: a__U31(tt,V2) >= a__U32(a__isNat(V2))
constraint: a__U31(X1,X2) >= U31(X1,X2)
constraint: mark(tt) >= tt
constraint: mark(s(X)) >= s(mark(X))
constraint: mark(0) >= 0
constraint: mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2))
constraint: mark(x(X1,X2)) >= a__x(mark(X1),mark(X2))
constraint: mark(U11(X1,X2)) >= a__U11(mark(X1),X2)
constraint: mark(U12(X)) >= a__U12(mark(X))
constraint: mark(isNat(X)) >= a__isNat(X)
constraint: mark(U21(X)) >= a__U21(mark(X))
constraint: mark(U31(X1,X2)) >= a__U31(mark(X1),X2)
constraint: mark(U32(X)) >= a__U32(mark(X))
constraint: mark(U41(X1,X2)) >= a__U41(mark(X1),X2)
constraint: mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3)
constraint: mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3)
constraint: mark(U61(X)) >= a__U61(mark(X))
constraint: mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3)
constraint: mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3)
constraint: a__U41(tt,N) >= mark(N)
constraint: a__U41(X1,X2) >= U41(X1,X2)
constraint: a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M)))
constraint: a__U52(X1,X2,X3) >= U52(X1,X2,X3)
constraint: a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N)
constraint: a__U51(X1,X2,X3) >= U51(X1,X2,X3)
constraint: a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N)
constraint: a__plus(N,0) >= a__U41(a__isNat(N),N)
constraint: a__plus(X1,X2) >= plus(X1,X2)
constraint: a__U61(tt) >= 0
constraint: a__U61(X) >= U61(X)
constraint: a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N))
constraint: a__U72(X1,X2,X3) >= U72(X1,X2,X3)
constraint: a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N)
constraint: a__U71(X1,X2,X3) >= U71(X1,X2,X3)
constraint: a__x(N,s(M)) >= a__U71(a__isNat(M),M,N)
constraint: a__x(N,0) >= a__U61(a__isNat(N))
constraint: a__x(X1,X2) >= x(X1,X2)
constraint: Marked_mark(U11(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U31(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U32(X)) >= Marked_mark(X)
APPLY CRITERIA (Graph splitting)
Found 1 components:

{  <Marked_mark(U32(X)) , Marked_mark(X)> 
      --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U32(X)) , Marked_mark(X)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U32(X)) , Marked_mark(X)>
  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
     --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
}
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_mark(U11(X1,X2)) >= Marked_mark(X1) ;
  Marked_mark(U32(X)) >= Marked_mark(X) ;
 }
 + Disjunctions:{ 
{
  Marked_mark(U11(X1,X2)) > Marked_mark(X1) ;
 }
{
  Marked_mark(U32(X)) > Marked_mark(X) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
Sat solver result read
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
constraint: a__U12(tt) >= tt
constraint: a__U12(X) >= U12(X)
constraint: a__isNat(s(V1)) >= a__U21(a__isNat(V1))
constraint: a__isNat(0) >= tt
constraint: a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2)
constraint: a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2)
constraint: a__isNat(X) >= isNat(X)
constraint: a__U11(tt,V2) >= a__U12(a__isNat(V2))
constraint: a__U11(X1,X2) >= U11(X1,X2)
constraint: a__U21(tt) >= tt
constraint: a__U21(X) >= U21(X)
constraint: a__U32(tt) >= tt
constraint: a__U32(X) >= U32(X)
constraint: a__U31(tt,V2) >= a__U32(a__isNat(V2))
constraint: a__U31(X1,X2) >= U31(X1,X2)
constraint: mark(tt) >= tt
constraint: mark(s(X)) >= s(mark(X))
constraint: mark(0) >= 0
constraint: mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2))
constraint: mark(x(X1,X2)) >= a__x(mark(X1),mark(X2))
constraint: mark(U11(X1,X2)) >= a__U11(mark(X1),X2)
constraint: mark(U12(X)) >= a__U12(mark(X))
constraint: mark(isNat(X)) >= a__isNat(X)
constraint: mark(U21(X)) >= a__U21(mark(X))
constraint: mark(U31(X1,X2)) >= a__U31(mark(X1),X2)
constraint: mark(U32(X)) >= a__U32(mark(X))
constraint: mark(U41(X1,X2)) >= a__U41(mark(X1),X2)
constraint: mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3)
constraint: mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3)
constraint: mark(U61(X)) >= a__U61(mark(X))
constraint: mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3)
constraint: mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3)
constraint: a__U41(tt,N) >= mark(N)
constraint: a__U41(X1,X2) >= U41(X1,X2)
constraint: a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M)))
constraint: a__U52(X1,X2,X3) >= U52(X1,X2,X3)
constraint: a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N)
constraint: a__U51(X1,X2,X3) >= U51(X1,X2,X3)
constraint: a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N)
constraint: a__plus(N,0) >= a__U41(a__isNat(N),N)
constraint: a__plus(X1,X2) >= plus(X1,X2)
constraint: a__U61(tt) >= 0
constraint: a__U61(X) >= U61(X)
constraint: a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N))
constraint: a__U72(X1,X2,X3) >= U72(X1,X2,X3)
constraint: a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N)
constraint: a__U71(X1,X2,X3) >= U71(X1,X2,X3)
constraint: a__x(N,s(M)) >= a__U71(a__isNat(M),M,N)
constraint: a__x(N,0) >= a__U61(a__isNat(N))
constraint: a__x(X1,X2) >= x(X1,X2)
constraint: Marked_mark(U11(X1,X2)) >= Marked_mark(X1)
constraint: Marked_mark(U32(X)) >= Marked_mark(X)
APPLY CRITERIA (Graph splitting)
Found 1 components:

{  <Marked_mark(U11(X1,X2)) , Marked_mark(X1)> 
      --> <Marked_mark(U11(X1,X2)) , Marked_mark(X1)>
}
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_mark(U11(X1,X2)) >= Marked_mark(X1) ;
 }
 + Disjunctions:{ 
{
  Marked_mark(U11(X1,X2)) > Marked_mark(X1) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
No solution found for these parameters.
Entering rpo_solver
=== TIMER virtual : 25.000000 ===
Search parameters: AFS type: 2 ; time limit: 25.. 
=== STOPING TIMER virtual ===
Time out for these parameters.
=== TIMER virtual : 15.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 15.000000 ===
=== STOPING TIMER real ===
Sat solver returned
Sat solver result read
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
constraint: a__U12(tt) >= tt
constraint: a__U12(X) >= U12(X)
constraint: a__isNat(s(V1)) >= a__U21(a__isNat(V1))
constraint: a__isNat(0) >= tt
constraint: a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2)
constraint: a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2)
constraint: a__isNat(X) >= isNat(X)
constraint: a__U11(tt,V2) >= a__U12(a__isNat(V2))
constraint: a__U11(X1,X2) >= U11(X1,X2)
constraint: a__U21(tt) >= tt
constraint: a__U21(X) >= U21(X)
constraint: a__U32(tt) >= tt
constraint: a__U32(X) >= U32(X)
constraint: a__U31(tt,V2) >= a__U32(a__isNat(V2))
constraint: a__U31(X1,X2) >= U31(X1,X2)
constraint: mark(tt) >= tt
constraint: mark(s(X)) >= s(mark(X))
constraint: mark(0) >= 0
constraint: mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2))
constraint: mark(x(X1,X2)) >= a__x(mark(X1),mark(X2))
constraint: mark(U11(X1,X2)) >= a__U11(mark(X1),X2)
constraint: mark(U12(X)) >= a__U12(mark(X))
constraint: mark(isNat(X)) >= a__isNat(X)
constraint: mark(U21(X)) >= a__U21(mark(X))
constraint: mark(U31(X1,X2)) >= a__U31(mark(X1),X2)
constraint: mark(U32(X)) >= a__U32(mark(X))
constraint: mark(U41(X1,X2)) >= a__U41(mark(X1),X2)
constraint: mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3)
constraint: mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3)
constraint: mark(U61(X)) >= a__U61(mark(X))
constraint: mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3)
constraint: mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3)
constraint: a__U41(tt,N) >= mark(N)
constraint: a__U41(X1,X2) >= U41(X1,X2)
constraint: a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M)))
constraint: a__U52(X1,X2,X3) >= U52(X1,X2,X3)
constraint: a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N)
constraint: a__U51(X1,X2,X3) >= U51(X1,X2,X3)
constraint: a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N)
constraint: a__plus(N,0) >= a__U41(a__isNat(N),N)
constraint: a__plus(X1,X2) >= plus(X1,X2)
constraint: a__U61(tt) >= 0
constraint: a__U61(X) >= U61(X)
constraint: a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N))
constraint: a__U72(X1,X2,X3) >= U72(X1,X2,X3)
constraint: a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N)
constraint: a__U71(X1,X2,X3) >= U71(X1,X2,X3)
constraint: a__x(N,s(M)) >= a__U71(a__isNat(M),M,N)
constraint: a__x(N,0) >= a__U61(a__isNat(N))
constraint: a__x(X1,X2) >= x(X1,X2)
constraint: Marked_mark(U11(X1,X2)) >= Marked_mark(X1)
APPLY CRITERIA (Graph splitting)
Found 0 components:
APPLY CRITERIA (Graph splitting)
Found 1 components:

{  <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)> 
      --> <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__U31(a__isNat(V1),V2)>
  <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__U11(a__isNat(V1),V2)>
  <Marked_a__isNat(x(V1,V2)) , Marked_a__U31(a__isNat(V1),V2)> 
     --> <Marked_a__U31(tt,V2) , Marked_a__isNat(V2)>
  <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__U31(a__isNat(V1),V2)>
  <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__U11(a__isNat(V1),V2)>
  <Marked_a__isNat(plus(V1,V2)) , Marked_a__U11(a__isNat(V1),V2)> 
     --> <Marked_a__U11(tt,V2) , Marked_a__isNat(V2)>
  <Marked_a__U31(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__U31(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__U31(a__isNat(V1),V2)>
  <Marked_a__U31(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__U31(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__U11(a__isNat(V1),V2)>
  <Marked_a__U11(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__U11(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(x(V1,V2)) , Marked_a__U31(a__isNat(V1),V2)>
  <Marked_a__U11(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__isNat(V1)>
  <Marked_a__U11(tt,V2) , Marked_a__isNat(V2)> 
     --> <Marked_a__isNat(plus(V1,V2)) , Marked_a__U11(a__isNat(V1),V2)>
}
APPLY CRITERIA (Choosing graph)
Trying to solve the following constraints:
{
  a__U12(tt) >= tt ;
  a__U12(X) >= U12(X) ;
  a__isNat(s(V1)) >= a__U21(a__isNat(V1)) ;
  a__isNat(0) >= tt ;
  a__isNat(plus(V1,V2)) >= a__U11(a__isNat(V1),V2) ;
  a__isNat(x(V1,V2)) >= a__U31(a__isNat(V1),V2) ;
  a__isNat(X) >= isNat(X) ;
  a__U11(tt,V2) >= a__U12(a__isNat(V2)) ;
  a__U11(X1,X2) >= U11(X1,X2) ;
  a__U21(tt) >= tt ;
  a__U21(X) >= U21(X) ;
  a__U32(tt) >= tt ;
  a__U32(X) >= U32(X) ;
  a__U31(tt,V2) >= a__U32(a__isNat(V2)) ;
  a__U31(X1,X2) >= U31(X1,X2) ;
  mark(tt) >= tt ;
  mark(s(X)) >= s(mark(X)) ;
  mark(0) >= 0 ;
  mark(plus(X1,X2)) >= a__plus(mark(X1),mark(X2)) ;
  mark(x(X1,X2)) >= a__x(mark(X1),mark(X2)) ;
  mark(U11(X1,X2)) >= a__U11(mark(X1),X2) ;
  mark(U12(X)) >= a__U12(mark(X)) ;
  mark(isNat(X)) >= a__isNat(X) ;
  mark(U21(X)) >= a__U21(mark(X)) ;
  mark(U31(X1,X2)) >= a__U31(mark(X1),X2) ;
  mark(U32(X)) >= a__U32(mark(X)) ;
  mark(U41(X1,X2)) >= a__U41(mark(X1),X2) ;
  mark(U51(X1,X2,X3)) >= a__U51(mark(X1),X2,X3) ;
  mark(U52(X1,X2,X3)) >= a__U52(mark(X1),X2,X3) ;
  mark(U61(X)) >= a__U61(mark(X)) ;
  mark(U71(X1,X2,X3)) >= a__U71(mark(X1),X2,X3) ;
  mark(U72(X1,X2,X3)) >= a__U72(mark(X1),X2,X3) ;
  a__U41(tt,N) >= mark(N) ;
  a__U41(X1,X2) >= U41(X1,X2) ;
  a__U52(tt,M,N) >= s(a__plus(mark(N),mark(M))) ;
  a__U52(X1,X2,X3) >= U52(X1,X2,X3) ;
  a__U51(tt,M,N) >= a__U52(a__isNat(N),M,N) ;
  a__U51(X1,X2,X3) >= U51(X1,X2,X3) ;
  a__plus(N,s(M)) >= a__U51(a__isNat(M),M,N) ;
  a__plus(N,0) >= a__U41(a__isNat(N),N) ;
  a__plus(X1,X2) >= plus(X1,X2) ;
  a__U61(tt) >= 0 ;
  a__U61(X) >= U61(X) ;
  a__U72(tt,M,N) >= a__plus(a__x(mark(N),mark(M)),mark(N)) ;
  a__U72(X1,X2,X3) >= U72(X1,X2,X3) ;
  a__U71(tt,M,N) >= a__U72(a__isNat(N),M,N) ;
  a__U71(X1,X2,X3) >= U71(X1,X2,X3) ;
  a__x(N,s(M)) >= a__U71(a__isNat(M),M,N) ;
  a__x(N,0) >= a__U61(a__isNat(N)) ;
  a__x(X1,X2) >= x(X1,X2) ;
  Marked_a__U31(tt,V2) >= Marked_a__isNat(V2) ;
  Marked_a__isNat(plus(V1,V2)) >= Marked_a__isNat(V1) ;
  Marked_a__isNat(plus(V1,V2)) >= Marked_a__U11(a__isNat(V1),V2) ;
  Marked_a__isNat(x(V1,V2)) >= Marked_a__U31(a__isNat(V1),V2) ;
  Marked_a__isNat(x(V1,V2)) >= Marked_a__isNat(V1) ;
  Marked_a__U11(tt,V2) >= Marked_a__isNat(V2) ;
 }
 + Disjunctions:{ 
{
  Marked_a__U31(tt,V2) > Marked_a__isNat(V2) ;
 }
{
  Marked_a__isNat(plus(V1,V2)) > Marked_a__isNat(V1) ;
 }
{
  Marked_a__isNat(plus(V1,V2)) > Marked_a__U11(a__isNat(V1),V2) ;
 }
{
  Marked_a__isNat(x(V1,V2)) > Marked_a__U31(a__isNat(V1),V2) ;
 }
{
  Marked_a__isNat(x(V1,V2)) > Marked_a__isNat(V1) ;
 }
{
  Marked_a__U11(tt,V2) > Marked_a__isNat(V2) ;
 }
 } 
=== TIMER virtual : 10.000000 ===
Entering poly_solver
Starting Sat solver initialization
Calling Sat solver...
=== STOPING TIMER virtual ===
=== TIMER real : 10.000000 ===
=== STOPING TIMER real ===
Sat solver returned
=== STOPING TIMER real ===
=== STOPING TIMER virtual ===
No solution found for these parameters.
Entering rpo_solver
=== TIMER virtual : 25.000000 ===
Search parameters: AFS type: 2 ; time limit: 25.. 

Global timeout: 300.000000