MAYBE We are left with following problem, upon which TcT provides the certificate MAYBE. Strict Trs: { b(c(x1)) -> d(c(x1)) , b(d(x1)) -> d(b(x1)) , a(d(x1)) -> a(b(b(x1))) } Obligation: innermost runtime complexity Answer: MAYBE The input cannot be shown compatible Arrrr..