MAYBE
* Step 1: ArgumentFilter MAYBE
    + Considered Problem:
        Rules:
          0. start(A,B,C) -> eval(A,B,C)              True     (1,1)
          1. eval(A,B,C)  -> eval(A + C,B,-2 + C)     [A >= 0] (?,1)
          2. eval(A,B,C)  -> eval(A + B,-2 + B,1 + C) [A >= 0] (?,1)
        Signature:
          {(eval,3);(start,3)}
        Flow Graph:
          [0->{1,2},1->{1,2},2->{1,2}]
        
    + Applied Processor:
        ArgumentFilter [1,2]
    + Details:
        We remove following argument positions: [1,2].
* Step 2: FromIts MAYBE
    + Considered Problem:
        Rules:
          0. start(A) -> eval(A)     True     (1,1)
          1. eval(A)  -> eval(A + C) [A >= 0] (?,1)
          2. eval(A)  -> eval(A + B) [A >= 0] (?,1)
        Signature:
          {(eval,3);(start,3)}
        Flow Graph:
          [0->{1,2},1->{1,2},2->{1,2}]
        
    + Applied Processor:
        FromIts
    + Details:
        ()
* Step 3: AddSinks MAYBE
    + Considered Problem:
        Rules:
          start(A) -> eval(A)      True
          eval(A)  -> eval(A + C)  [A >= 0]
          eval(A)  -> eval(A + B)  [A >= 0]
        Signature:
          {(eval,3);(start,3)}
        Rule Graph:
          [0->{1,2},1->{1,2},2->{1,2}]
    + Applied Processor:
        AddSinks
    + Details:
        ()
* Step 4: Failure MAYBE
  + Considered Problem:
      Rules:
        start(A) -> eval(A)       True
        eval(A)  -> eval(A + C)   [A >= 0]
        eval(A)  -> eval(A + B)   [A >= 0]
        eval(A)  -> exitus616(A)  True
        eval(A)  -> exitus616(A)  True
      Signature:
        {(eval,3);(exitus616,1);(start,3)}
      Rule Graph:
        [0->{1,2},1->{1,2,3},2->{1,2,4}]
  + Applied Processor:
      Decompose Greedy
  + Details:
      We construct a looptree:
        P: [0,1,2,3,4]
        |
        `- p:[1,2] c: []
MAYBE