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