Marked_andproperMarked_activettMarked_s0topactiveMarked_plussMarked_topandMarked_properplusokmarkX2X1MNXactive(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_active(plus(N,s(M)))Marked_s(plus(N,M))Marked_active(plus(N,s(M)))Marked_plus(N,M)Marked_active(and(X1,X2))Marked_and(active(X1),X2)Marked_active(and(X1,X2))Marked_active(X1)Marked_active(plus(X1,X2))Marked_plus(active(X1),X2)Marked_active(plus(X1,X2))Marked_active(X1)Marked_active(plus(X1,X2))Marked_plus(X1,active(X2))Marked_active(plus(X1,X2))Marked_active(X2)Marked_active(s(X))Marked_s(active(X))Marked_active(s(X))Marked_active(X)Marked_and(mark(X1),X2)Marked_and(X1,X2)Marked_plus(mark(X1),X2)Marked_plus(X1,X2)Marked_plus(X1,mark(X2))Marked_plus(X1,X2)Marked_s(mark(X))Marked_s(X)Marked_proper(and(X1,X2))Marked_and(proper(X1),proper(X2))Marked_proper(and(X1,X2))Marked_proper(X1)Marked_proper(and(X1,X2))Marked_proper(X2)Marked_proper(plus(X1,X2))Marked_plus(proper(X1),proper(X2))Marked_proper(plus(X1,X2))Marked_proper(X1)Marked_proper(plus(X1,X2))Marked_proper(X2)Marked_proper(s(X))Marked_s(proper(X))Marked_proper(s(X))Marked_proper(X)Marked_and(ok(X1),ok(X2))Marked_and(X1,X2)Marked_plus(ok(X1),ok(X2))Marked_plus(X1,X2)Marked_s(ok(X))Marked_s(X)Marked_top(mark(X))Marked_top(proper(X))Marked_top(mark(X))Marked_proper(X)Marked_top(ok(X))Marked_top(active(X))Marked_top(ok(X))Marked_active(X)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_top(mark(X))Marked_top(proper(X))Marked_top(ok(X))Marked_top(active(X))mark110ok10plus220and1110Marked_top10s210active10top0010tt0proper10Marked_top(mark(X))Marked_top(proper(X))active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_top(ok(X))Marked_top(active(X))active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_top(ok(X))Marked_top(active(X))mark0ok220plus330and10Marked_top30s10active20top0020tt20proper230active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_proper(and(X1,X2))Marked_proper(X1)Marked_proper(and(X1,X2))Marked_proper(X2)Marked_proper(plus(X1,X2))Marked_proper(X1)Marked_proper(plus(X1,X2))Marked_proper(X2)Marked_proper(s(X))Marked_proper(X)mark0ok0plus220Marked_proper30and2120s20active20top0020tt0proper10Marked_proper(and(X1,X2))Marked_proper(X1)Marked_proper(and(X1,X2))Marked_proper(X2)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_proper(plus(X1,X2))Marked_proper(X1)Marked_proper(plus(X1,X2))Marked_proper(X2)Marked_proper(s(X))Marked_proper(X)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_proper(plus(X1,X2))Marked_proper(X1)Marked_proper(plus(X1,X2))Marked_proper(X2)Marked_proper(s(X))Marked_proper(X)mark0ok0plus220Marked_proper30and0s110active10top000tt20proper10Marked_proper(s(X))Marked_proper(X)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_proper(plus(X1,X2))Marked_proper(X1)Marked_proper(plus(X1,X2))Marked_proper(X2)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_proper(plus(X1,X2))Marked_proper(X1)Marked_proper(plus(X1,X2))Marked_proper(X2)mark20ok0plus1110Marked_proper30and20s20active20top0020tt20proper10active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_active(and(X1,X2))Marked_active(X1)Marked_active(plus(X1,X2))Marked_active(X1)Marked_active(plus(X1,X2))Marked_active(X2)Marked_active(s(X))Marked_active(X)mark10ok0plus220and1120s20active20top000tt20Marked_active30proper10Marked_active(and(X1,X2))Marked_active(X1)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_active(plus(X1,X2))Marked_active(X1)Marked_active(plus(X1,X2))Marked_active(X2)Marked_active(s(X))Marked_active(X)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_active(plus(X1,X2))Marked_active(X1)Marked_active(plus(X1,X2))Marked_active(X2)Marked_active(s(X))Marked_active(X)mark0ok0plus220and20s120active10top000tt0Marked_active30proper10Marked_active(s(X))Marked_active(X)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_active(plus(X1,X2))Marked_active(X1)Marked_active(plus(X1,X2))Marked_active(X2)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_active(plus(X1,X2))Marked_active(X1)Marked_active(plus(X1,X2))Marked_active(X2)mark0ok0plus1110and0s0active10top000tt0Marked_active30proper10active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_and(mark(X1),X2)Marked_and(X1,X2)Marked_and(ok(X1),ok(X2))Marked_and(X1,X2)mark0ok120plus20and10s130active10top0030tt20proper30Marked_and10Marked_and(ok(X1),ok(X2))Marked_and(X1,X2)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_and(mark(X1),X2)Marked_and(X1,X2)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_and(mark(X1),X2)Marked_and(X1,X2)mark210ok0plus110and110s10active210top000tt0proper0Marked_and30active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_plus(mark(X1),X2)Marked_plus(X1,X2)Marked_plus(X1,mark(X2))Marked_plus(X1,X2)Marked_plus(ok(X1),ok(X2))Marked_plus(X1,X2)mark10ok120plus10and2220s10Marked_plus10active20top0010tt10proper30Marked_plus(ok(X1),ok(X2))Marked_plus(X1,X2)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_plus(mark(X1),X2)Marked_plus(X1,X2)Marked_plus(X1,mark(X2))Marked_plus(X1,X2)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_plus(mark(X1),X2)Marked_plus(X1,X2)Marked_plus(X1,mark(X2))Marked_plus(X1,X2)mark110ok0plus2110and220s220Marked_plus330active20top000tt10proper10active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_s(mark(X))Marked_s(X)Marked_s(ok(X))Marked_s(X)mark210ok10plus220and1110s210active10top0020Marked_s30tt10proper10Marked_s(mark(X))Marked_s(X)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_s(ok(X))Marked_s(X)active(and(tt,X))mark(X)active(plus(N,0))mark(N)active(plus(N,s(M)))mark(s(plus(N,M)))active(and(X1,X2))and(active(X1),X2)active(plus(X1,X2))plus(active(X1),X2)active(plus(X1,X2))plus(X1,active(X2))active(s(X))s(active(X))and(mark(X1),X2)mark(and(X1,X2))plus(mark(X1),X2)mark(plus(X1,X2))plus(X1,mark(X2))mark(plus(X1,X2))s(mark(X))mark(s(X))proper(and(X1,X2))and(proper(X1),proper(X2))proper(tt)ok(tt)proper(plus(X1,X2))plus(proper(X1),proper(X2))proper(0)ok(0)proper(s(X))s(proper(X))and(ok(X1),ok(X2))ok(and(X1,X2))plus(ok(X1),ok(X2))ok(plus(X1,X2))s(ok(X))ok(s(X))top(mark(X))top(proper(X))top(ok(X))top(active(X))Marked_s(ok(X))Marked_s(X)mark0ok120plus10and10s10active20top000Marked_s30tt0proper20