MAYBE

'Pop* (timeout of 60.0 seconds)'
--------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  add(true(), x, xs) ->
       add(and(isNat(x), isList(xs)), x, Cons(x, xs))
     , isList(Cons(x, xs)) -> isList(xs)
     , isList(nil()) -> true()
     , isNat(s(x)) -> isNat(x)
     , isNat(0()) -> true()
     , if(true(), x, y) -> x
     , if(false(), x, y) -> y
     , and(true(), true()) -> true()
     , and(false(), x) -> false()
     , and(x, false()) -> false()}

Proof Output:    
  The input cannot be shown compatible