MAYBE
* Step 1: Failure MAYBE
  + Considered Problem:
      - Strict TRS:
          activate(X) -> X
          activate(n__fib1(X1,X2)) -> fib1(X1,X2)
          add(0(),X) -> X
          add(s(X),Y) -> s(add(X,Y))
          fib(N) -> sel(N,fib1(s(0()),s(0())))
          fib1(X,Y) -> cons(X,n__fib1(Y,add(X,Y)))
          fib1(X1,X2) -> n__fib1(X1,X2)
          sel(0(),cons(X,XS)) -> X
          sel(s(N),cons(X,XS)) -> sel(N,activate(XS))
      - Signature:
          {activate/1,add/2,fib/1,fib1/2,sel/2} / {0/0,cons/2,n__fib1/2,s/1}
      - Obligation:
          innermost runtime complexity wrt. defined symbols {activate,add,fib,fib1,sel} and constructors {0,cons
          ,n__fib1,s}
  + Applied Processor:
      NaturalPI {shape = Mixed 3, restrict = NoRestrict, uargs = UArgs, urules = URules, selector = Nothing}
  + Details:
      Incompatible
MAYBE