TIMEOUT

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

Strict Trs:
  { b(c(x1)) -> d(c(x1))
  , b(d(x1)) -> d(b(x1))
  , a(d(x1)) -> a(b(b(x1))) }
Obligation:
  innermost runtime complexity
Answer:
  TIMEOUT

Computation stopped due to timeout after 60.0 seconds.

Arrrr..