TRS:
 {         f(x, y, z) -> g(<=(x, y), x, y, z),
   g(true(), x, y, z) -> z,
  g(false(), x, y, z) -> f(f(p(x), y, z), f(p(y), z, x), f(p(z), x, y)),
               p(0()) -> 0(),
              p(s(x)) -> x}
 Fail