TRS:
 {                le(0(), y) -> true(),
               le(s(x), 0()) -> false(),
              le(s(x), s(y)) -> le(x, y),
               minus(0(), y) -> 0(),
              minus(s(x), y) -> if_minus(le(s(x), y), s(x), y),
   if_minus(true(), s(x), y) -> 0(),
  if_minus(false(), s(x), y) -> s(minus(x, y)),
             quot(0(), s(y)) -> 0(),
            quot(s(x), s(y)) -> s(quot(minus(x, y), s(y))),
                 log(s(0())) -> 0(),
                log(s(s(x))) -> s(log(s(quot(x, s(s(0()))))))}
 Fail