TRS:
 {f(true(), x, y) -> f(gt(x, y), trunc(x), s(y)),
       trunc(0()) -> 0(),
    trunc(s(0())) -> 0(),
   trunc(s(s(x))) -> s(s(trunc(x))),
       gt(0(), v) -> false(),
    gt(s(u), 0()) -> true(),
   gt(s(u), s(v)) -> gt(u, v)}
 Fail