RL AAA = (BBB, CCC) BBB = (DDD, EEE) CCC = (ZZZ, GGG) DDD = (DDD, DDD) EEE = (EEE, EEE) GGG = (GGG, GGG) ZZZ = (ZZZ, ZZZ)
Part two: 2 steps
AAA → 2 steps to a ..Z
ZZZ ← ZZZ → ZZZ
Part one: 2 steps
BBB ← AAA → CCC
DDD ← BBB → EEE
ZZZ ← CCC → GGG
DDD ← DDD → DDD
EEE ← EEE → EEE
GGG ← GGG → GGG
ZZZ ← ZZZ → ZZZ