Input TRS:
    1: a__f(0()) -> cons(0(),f(s(0())))
    2: a__f(s(0())) -> a__f(a__p(s(0())))
    3: a__p(s(0())) -> 0()
    4: mark(f(X)) -> a__f(mark(X))
    5: mark(p(X)) -> a__p(mark(X))
    6: mark(0()) -> 0()
    7: mark(cons(X1,X2)) -> cons(mark(X1),X2)
    8: mark(s(X)) -> s(mark(X))
    9: a__f(X) -> f(X)
    10: a__p(X) -> p(X)
Number of Rules: 10
Direct POLO(mPol) ... failed.