MAYBE

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

Strict Trs:
  { a__f(X1, X2, X3) -> f(X1, X2, X3)
  , a__f(b(), X, c()) -> a__f(X, a__c(), X)
  , a__c() -> b()
  , a__c() -> c()
  , mark(b()) -> b()
  , mark(c()) -> a__c()
  , mark(f(X1, X2, X3)) -> a__f(X1, mark(X2), X3) }
Obligation:
  innermost runtime complexity
Answer:
  MAYBE

The input cannot be shown compatible

Arrrr..