Input TRS:
    1: f(0()) -> cons(0(),n__f(s(0())))
    2: f(s(0())) -> f(p(s(0())))
    3: p(s(0())) -> 0()
    4: f(X) -> n__f(X)
    5: activate(n__f(X)) -> f(X)
    6: activate(X) -> X
Number of Rules: 6
Direct QWPOS(Sum) ... failed.