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