#12456
A B C

1b 1c 1d
2a 2b 2c
3d 3c 3d
4d 4a 4b
5b 5d 5a
6c 6d 6a
7a 7b 7c
8b 8c 8d
9d 9a 9b
10c 10b 10c
11c 11a 11b
12a 12b 12c
13d 13a 13b
14c 14d 14a
15b 15d 15c
16c 16b 16d
17- 17- 17-
18b 18c 18b
19c 19d 19a
20b 20c 20d