MAYBE
* Step 1: FromIts MAYBE
    + Considered Problem:
        Rules:
          0. start(A,B) -> eval(A,B)          True               (1,1)
          1. eval(A,B)  -> eval(-2 + B,1 + A) [A >= 1 && B >= 1] (?,1)
          2. eval(A,B)  -> eval(-1 + A,A)     [A >= 1 && B >= 1] (?,1)
        Signature:
          {(eval,2);(start,2)}
        Flow Graph:
          [0->{1,2},1->{1,2},2->{1,2}]
        
    + Applied Processor:
        FromIts
    + Details:
        ()
* Step 2: AddSinks MAYBE
    + Considered Problem:
        Rules:
          start(A,B) -> eval(A,B)           True
          eval(A,B)  -> eval(-2 + B,1 + A)  [A >= 1 && B >= 1]
          eval(A,B)  -> eval(-1 + A,A)      [A >= 1 && B >= 1]
        Signature:
          {(eval,2);(start,2)}
        Rule Graph:
          [0->{1,2},1->{1,2},2->{1,2}]
    + Applied Processor:
        AddSinks
    + Details:
        ()
* Step 3: Failure MAYBE
  + Considered Problem:
      Rules:
        start(A,B) -> eval(A,B)           True
        eval(A,B)  -> eval(-2 + B,1 + A)  [A >= 1 && B >= 1]
        eval(A,B)  -> eval(-1 + A,A)      [A >= 1 && B >= 1]
        eval(A,B)  -> exitus616(A,B)      True
        eval(A,B)  -> exitus616(A,B)      True
      Signature:
        {(eval,2);(exitus616,2);(start,2)}
      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