MAYBE We are left with following problem, upon which TcT provides the certificate MAYBE. Strict Trs: { f(g(i(a(), b(), b'()), c()), d()) -> if(e(), f(.(b(), c()), d'()), f(.(b'(), c()), d'())) , f(g(h(a(), b()), c()), d()) -> if(e(), f(.(b(), g(h(a(), b()), c())), d()), f(c(), d'())) } Obligation: innermost runtime complexity Answer: MAYBE The input cannot be shown compatible Arrrr..