MAYBE

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

Strict Trs:
  { d(0()) -> 0()
  , d(s(x)) -> s(s(d(x)))
  , e(0(), x) -> x
  , e(s(x), y) -> e(x, d(y)) }
Obligation:
  innermost runtime complexity
Answer:
  MAYBE

The input cannot be shown compatible

Arrrr..