0
1 - 18 1 - 12 1 2 3
4 5 6
EVEN 7 8 9
10 11 12
13 - 24 12 14 15
16 17 18
19 20 21
22 23 24
ODD 19 - 36 25 26 27
28 29 30
25 - 36 31 32 33
34 35 36