(VAR x y) (RULES c -> f(a,h(b)) f(h(f(f(a,a),h(a))),g(f(x,g(b)))) -> c c -> c g(g(a)) -> f(h(g(f(c,c))),f(f(g(c),a),g(f(a,a)))) f(x,y) -> f(y,x) ) (COMMENT submitted by: Miguel Vitores and Salvador Lucas secret problem 2022 category: TRS )