TRS:
 { cond1(true(), x, y) -> cond2(gr(x, y), x, y),
   cond2(true(), x, y) -> cond1(gr0(x), y, y),
  cond2(false(), x, y) -> cond1(gr0(x), p(x), y),
            gr(0(), x) -> false(),
         gr(s(x), 0()) -> true(),
        gr(s(x), s(y)) -> gr(x, y),
              gr0(0()) -> false(),
             gr0(s(x)) -> true(),
                p(0()) -> 0(),
               p(s(x)) -> x}
 Fail