test (123B)
1 RL 2 3 AAA = (BBB, CCC) 4 CCC = (ZZZ, GGG) 5 DDD = (DDD, DDD) 6 BBB = (DDD, EEE) 7 GGG = (GGG, GGG) 8 EEE = (EEE, EEE) 9 ZZZ = (ZZZ, ZZZ)