NO
* Step 1: FromIts NO
    + Considered Problem:
        Rules:
          0. f1(A,B,C,D) -> f1(-1 + A,B,C,D)             [A >= 1] (?,1)
          1. f1(A,B,C,D) -> f1(A + B,B + C,C + D,-1 + D) [A >= 1] (?,1)
          2. f0(A,B,C,D) -> f1(A,B,C,D)                  True     (1,1)
        Signature:
          {(f0,4);(f1,4)}
        Flow Graph:
          [0->{0,1},1->{0,1},2->{0,1}]
        
    + Applied Processor:
        FromIts
    + Details:
        ()
* Step 2: CloseWith NO
    + Considered Problem:
        Rules:
          f1(A,B,C,D) -> f1(-1 + A,B,C,D)              [A >= 1]
          f1(A,B,C,D) -> f1(A + B,B + C,C + D,-1 + D)  [A >= 1]
          f0(A,B,C,D) -> f1(A,B,C,D)                   True
        Signature:
          {(f0,4);(f1,4)}
        Rule Graph:
          [0->{0,1},1->{0,1},2->{0,1}]
    + Applied Processor:
        CloseWith False
    + Details:
        ()

NO