MAYBE
* Step 1: AddSinks MAYBE
    + Considered Problem:
        Rules:
          0. f1(A,B) -> f2(A,B)        [0 >= 1 + A + B && A >= 1]                                      (1,1)
          1. f2(A,B) -> f2(A + -1*B,B) [-2 + -1*B >= 0 && -3 + A + -1*B >= 0 && -1 + A >= 0 && A >= 0] (?,1)
        Signature:
          {(f1,2);(f2,2)}
        Flow Graph:
          [0->{1},1->{1}]
        
    + Applied Processor:
        AddSinks
    + Details:
        ()
* Step 2: Failure MAYBE
  + Considered Problem:
      Rules:
        0. f1(A,B) -> f2(A,B)        [0 >= 1 + A + B && A >= 1]                                      (1,1)
        1. f2(A,B) -> f2(A + -1*B,B) [-2 + -1*B >= 0 && -3 + A + -1*B >= 0 && -1 + A >= 0 && A >= 0] (?,1)
        2. f2(A,B) -> exitus616(A,B) True                                                            (?,1)
      Signature:
        {(exitus616,2);(f1,2);(f2,2)}
      Flow Graph:
        [0->{1,2},1->{1,2},2->{}]
      
  + Applied Processor:
      LooptreeTransformer
  + Details:
      We construct a looptree:
        P: [0,1,2]
        |
        `- p:[1] c: []
MAYBE