NO Problem: f(g(x),s(0())) -> f(g(x),g(x)) g(s(x)) -> s(g(x)) g(0()) -> 0() Proof: Unfolding Processor: loop length: 3 terms: f(g(s(0())),g(s(0()))) f(g(s(0())),s(g(0()))) f(g(s(0())),s(0())) context: [] substitution: Qed