MAYBE
* Step 1: Failure MAYBE
  + Considered Problem:
      - Strict TRS:
          fib(0()) -> 0()
          fib(s(0())) -> s(0())
          fib(s(s(x))) -> +(fib(s(x)),fib(x))
      - Signature:
          {fib/1} / {+/2,0/0,s/1}
      - Obligation:
          innermost runtime complexity wrt. defined symbols {fib} and constructors {+,0,s}
  + Applied Processor:
      NaturalPI {shape = Mixed 3, restrict = NoRestrict, uargs = UArgs, urules = URules, selector = Nothing}
  + Details:
      Incompatible
MAYBE