TRS: { a__g(X) -> a__h(X), a__c() -> d(), a__h(d()) -> a__g(c()), mark(g(X)) -> a__g(X), mark(h(X)) -> a__h(X), mark(c()) -> a__c(), mark(d()) -> d(), a__g(X) -> g(X), a__h(X) -> h(X), a__c() -> c()} Fail