MAYBE

'Pop* (timeout of 60.0 seconds)'
--------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  fib(N) -> sel(N, fib1(s(0()), s(0())))
     , fib1(X, Y) -> cons(X, n__fib1(Y, add(X, Y)))
     , add(0(), X) -> X
     , add(s(X), Y) -> s(add(X, Y))
     , sel(0(), cons(X, XS)) -> X
     , sel(s(N), cons(X, XS)) -> sel(N, activate(XS))
     , fib1(X1, X2) -> n__fib1(X1, X2)
     , activate(n__fib1(X1, X2)) -> fib1(X1, X2)
     , activate(X) -> X}

Proof Output:    
  The input cannot be shown compatible