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