MAYBE

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

Strict Trs:
  { rev(nil()) -> nil()
  , rev(++(x, y)) -> ++(rev1(x, y), rev2(x, y))
  , rev1(x, nil()) -> x
  , rev1(x, ++(y, z)) -> rev1(y, z)
  , rev2(x, nil()) -> nil()
  , rev2(x, ++(y, z)) -> rev(++(x, rev(rev2(y, z)))) }
Obligation:
  innermost runtime complexity
Answer:
  MAYBE

The input cannot be shown compatible

Arrrr..