Input TRS:
    1: active(f(f(a()))) -> mark(f(g(f(a()))))
    2: active(g(X)) -> g(active(X))
    3: g(mark(X)) -> mark(g(X))
    4: proper(f(X)) -> f(proper(X))
    5: proper(a()) -> ok(a())
    6: proper(g(X)) -> g(proper(X))
    7: f(ok(X)) -> ok(f(X))
    8: g(ok(X)) -> ok(g(X))
    9: top(mark(X)) -> top(proper(X))
    10: top(ok(X)) -> top(active(X))
Number of Rules: 10
Direct QWPOS(mPol) ... failed.