MAYBE * Step 1: Failure MAYBE + 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: Failing "Open problems left." + Details: Open problems left. MAYBE