MAYBE
* Step 1: Failure MAYBE
  + Considered Problem:
      - Strict TRS:
          a__f(X1,X2) -> f(X1,X2)
          a__f(g(X),Y) -> a__f(mark(X),f(g(X),Y))
          mark(f(X1,X2)) -> a__f(mark(X1),X2)
          mark(g(X)) -> g(mark(X))
      - Signature:
          {a__f/2,mark/1} / {f/2,g/1}
      - Obligation:
          innermost runtime complexity wrt. defined symbols {a__f,mark} and constructors {f,g}
  + Applied Processor:
      NaturalPI {shape = Mixed 3, restrict = NoRestrict, uargs = UArgs, urules = URules, selector = Nothing}
  + Details:
      Incompatible
MAYBE