L: First CGC

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