MAYBE

'Pop* with parameter subtitution (timeout of 60.0 seconds)'
-----------------------------------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  f(tt(), x) -> f(isList(x), x)
     , isList(Cons(x, xs())) -> isList(xs())
     , isList(nil()) -> tt()}

Proof Output:    
  The input cannot be shown compatible