MAYBE We are left with following problem, upon which TcT provides the certificate MAYBE. Strict Trs: { f(X1, X2) -> n__f(X1, X2) , f(g(X), Y) -> f(X, n__f(g(X), activate(Y))) , activate(X) -> X , activate(n__f(X1, X2)) -> f(X1, X2) } Obligation: innermost runtime complexity Answer: MAYBE The input cannot be shown compatible Arrrr..