k = 6 0 A -> A 1 A -> A 2 A -> A 3 B -> B 4 B -> B 5 B -> B 6 A -> B 7 A -> B 8 A -> B 9 B -> A 10 B -> A 11 B -> A 12 A -> A 13 A -> A 14 A -> A 15 B -> B 16 B -> B 17 B -> B