I RGB 受 Backmarking example 000 3000 2○0 4◎○ Skipping a step 上〓 Backmarking example domain 20Backmarking example Variable # 1 2 3 4 5 0 0 0 0 0 B 5 4 3 2 1 i mbl R G 0 0 0 3 0 0 2 0 0 1 0 0 0 0 0 Remaining domain Skipping a step Backmarking example Variable # 1 2 3 4 5 0 0 0 0 0 B 5 4 3 2 1 i mbl R G 1 0 0 3 0 0 2 0 0 1 0 0 0 0 0 Remaining domain X X