MAYBE

We are left with following problem, upon which TcT provides the
certificate MAYBE.

Strict Trs:
  { le(0(), y) -> true()
  , le(s(x), 0()) -> false()
  , le(s(x), s(y)) -> le(x, y)
  , mod(x, 0()) -> modZeroErro()
  , mod(x, s(y)) -> modIter(x, s(y), 0(), 0())
  , modIter(x, s(y), z, u) -> if(le(x, z), x, s(y), z, u)
  , if(true(), x, y, z, u) -> u
  , if(false(), x, y, z, u) -> if2(le(y, s(u)), x, y, s(z), s(u))
  , if2(true(), x, y, z, u) -> modIter(x, y, z, 0())
  , if2(false(), x, y, z, u) -> modIter(x, y, z, u) }
Obligation:
  innermost runtime complexity
Answer:
  MAYBE

The input cannot be shown compatible

Arrrr..