TIMEOUT We are left with following problem, upon which TcT provides the certificate TIMEOUT. Strict Trs: { f(x, empty()) -> x , f(empty(), cons(a, k)) -> f(cons(a, k), k) , f(cons(a, k), y) -> f(y, k) } Obligation: innermost runtime complexity Answer: TIMEOUT Computation stopped due to timeout after 10.0 seconds. Arrrr..