Marked_remsfMarked_normnormremnilgMarked_f0zyxnorm(nil)0norm(g(x,y))s(norm(x))f(x,nil)g(nil,x)f(x,g(y,z))g(f(x,y),z)rem(nil,y)nilrem(g(x,y),0)g(x,y)rem(g(x,y),s(z))rem(x,z)norm(nil)0norm(g(x,y))s(norm(x))f(x,nil)g(nil,x)f(x,g(y,z))g(f(x,y),z)rem(nil,y)nilrem(g(x,y),0)g(x,y)rem(g(x,y),s(z))rem(x,z)Marked_norm(g(x,y))Marked_norm(x)Marked_f(x,g(y,z))Marked_f(x,y)Marked_rem(g(x,y),s(z))Marked_rem(x,z)norm(nil)0norm(g(x,y))s(norm(x))f(x,nil)g(nil,x)f(x,g(y,z))g(f(x,y),z)rem(nil,y)nilrem(g(x,y),0)g(x,y)rem(g(x,y),s(z))rem(x,z)Marked_norm(g(x,y))Marked_norm(x)Marked_norm1Marked_norm(g(x,y))Marked_norm(x)norm(nil)0norm(g(x,y))s(norm(x))f(x,nil)g(nil,x)f(x,g(y,z))g(f(x,y),z)rem(nil,y)nilrem(g(x,y),0)g(x,y)rem(g(x,y),s(z))rem(x,z)norm(nil)0norm(g(x,y))s(norm(x))f(x,nil)g(nil,x)f(x,g(y,z))g(f(x,y),z)rem(nil,y)nilrem(g(x,y),0)g(x,y)rem(g(x,y),s(z))rem(x,z)Marked_f(x,g(y,z))Marked_f(x,y)Marked_f2Marked_f(x,g(y,z))Marked_f(x,y)norm(nil)0norm(g(x,y))s(norm(x))f(x,nil)g(nil,x)f(x,g(y,z))g(f(x,y),z)rem(nil,y)nilrem(g(x,y),0)g(x,y)rem(g(x,y),s(z))rem(x,z)norm(nil)0norm(g(x,y))s(norm(x))f(x,nil)g(nil,x)f(x,g(y,z))g(f(x,y),z)rem(nil,y)nilrem(g(x,y),0)g(x,y)rem(g(x,y),s(z))rem(x,z)Marked_rem(g(x,y),s(z))Marked_rem(x,z)Marked_rem1Marked_rem(g(x,y),s(z))Marked_rem(x,z)norm(nil)0norm(g(x,y))s(norm(x))f(x,nil)g(nil,x)f(x,g(y,z))g(f(x,y),z)rem(nil,y)nilrem(g(x,y),0)g(x,y)rem(g(x,y),s(z))rem(x,z)