TIMEOUT

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

Strict Trs:
  { @([](), ys) -> ys
  , @(::(x, xs), ys) -> ::(x, @(xs, ys))
  , rev([]()) -> []()
  , rev(::(x, xs)) -> @(rev(xs), ::(x, []()))
  , shuffle([]()) -> []()
  , shuffle(::(x, xs)) -> ::(x, shuffle(rev(xs))) }
Obligation:
  runtime complexity
Answer:
  TIMEOUT

Computation stopped due to timeout after 300.0 seconds.

Arrrr..