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