TRS: { app(nil(), k) -> k, app(l, nil()) -> l, app(cons(x, l), k) -> cons(x, app(l, k)), sum(cons(x, nil())) -> cons(x, nil()), sum(cons(x, cons(y, l))) -> sum(cons(a(x, y, h()), l)), a(h(), h(), x) -> s(x), a(x, s(y), h()) -> a(x, y, s(h())), a(x, s(y), s(z)) -> a(x, y, a(x, s(y), z)), a(s(x), h(), z) -> a(x, z, z)} Fail