MAYBE
* Step 1: TrivialSCCs MAYBE
    + Considered Problem:
        Rules:
          0. f0(A,B,C) -> f1(0,B,C)      True               (1,1)
          1. f1(A,B,C) -> f1(A,-1 + B,D) [B >= 1 && D >= 1] (?,1)
          2. f1(A,B,C) -> f1(A,-2 + B,D) [B >= 1 && 0 >= D] (?,1)
          3. f1(A,B,C) -> f4(A,B,D)      [0 >= B]           (?,1)
          4. f4(A,B,C) -> f4(1,B,D)      [C >= 1]           (?,1)
          5. f4(A,B,C) -> f4(2,B,D)      [0 >= C]           (?,1)
        Signature:
          {(f0,3);(f1,3);(f4,3)}
        Flow Graph:
          [0->{1,2,3},1->{1,2,3},2->{1,2,3},3->{4,5},4->{4,5},5->{4,5}]
        
    + Applied Processor:
        TrivialSCCs
    + Details:
        All trivial SCCs of the transition graph admit timebound 1.
* Step 2: AddSinks MAYBE
    + Considered Problem:
        Rules:
          0. f0(A,B,C) -> f1(0,B,C)      True               (1,1)
          1. f1(A,B,C) -> f1(A,-1 + B,D) [B >= 1 && D >= 1] (?,1)
          2. f1(A,B,C) -> f1(A,-2 + B,D) [B >= 1 && 0 >= D] (?,1)
          3. f1(A,B,C) -> f4(A,B,D)      [0 >= B]           (1,1)
          4. f4(A,B,C) -> f4(1,B,D)      [C >= 1]           (?,1)
          5. f4(A,B,C) -> f4(2,B,D)      [0 >= C]           (?,1)
        Signature:
          {(f0,3);(f1,3);(f4,3)}
        Flow Graph:
          [0->{1,2,3},1->{1,2,3},2->{1,2,3},3->{4,5},4->{4,5},5->{4,5}]
        
    + Applied Processor:
        AddSinks
    + Details:
        ()
* Step 3: Failure MAYBE
  + Considered Problem:
      Rules:
        0. f0(A,B,C) -> f1(0,B,C)        True               (1,1)
        1. f1(A,B,C) -> f1(A,-1 + B,D)   [B >= 1 && D >= 1] (?,1)
        2. f1(A,B,C) -> f1(A,-2 + B,D)   [B >= 1 && 0 >= D] (?,1)
        3. f1(A,B,C) -> f4(A,B,D)        [0 >= B]           (?,1)
        4. f4(A,B,C) -> f4(1,B,D)        [C >= 1]           (?,1)
        5. f4(A,B,C) -> f4(2,B,D)        [0 >= C]           (?,1)
        6. f4(A,B,C) -> exitus616(A,B,C) True               (?,1)
      Signature:
        {(exitus616,3);(f0,3);(f1,3);(f4,3)}
      Flow Graph:
        [0->{1,2,3},1->{1,2,3},2->{1,2,3},3->{4,5,6},4->{4,5,6},5->{4,5,6},6->{}]
      
  + Applied Processor:
      LooptreeTransformer
  + Details:
      We construct a looptree:
        P: [0,1,2,3,4,5,6]
        |
        +- p:[1,2] c: [2]
        |  |
        |  `- p:[1] c: [1]
        |
        `- p:[4,5] c: []
MAYBE