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