0 1 1 0 2 2 4 a A 4 1 A 2 5 a A 5 2 A 2 6 a A 6 3 A 0 3 3 7 b B 7 1 B 3 8 b B 8 3 B 3 9 b B 9 2 B 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9