Input TRS:
    1: a__f(f(X)) -> a__c(f(g(f(X))))
    2: a__c(X) -> d(X)
    3: a__h(X) -> a__c(d(X))
    4: mark(f(X)) -> a__f(mark(X))
    5: mark(c(X)) -> a__c(X)
    6: mark(h(X)) -> a__h(mark(X))
    7: mark(g(X)) -> g(X)
    8: mark(d(X)) -> d(X)
    9: a__f(X) -> f(X)
    10: a__c(X) -> c(X)
    11: a__h(X) -> h(X)
Number of Rules: 11
Direct POLO(mPol) ... failed.