20
11 12 16 13 20 15 14 17 18 19 
11 15 16 20 14 13 12 18 17 19 
17 14 11 12 20 19 18 13 16 15 
17 18 19 13 14 20 16 15 12 11 
16 14 17 19 18 11 12 15 20 13 
12 11 13 14 17 18 20 19 15 16 
13 14 18 17 16 20 19 11 15 12 
11 14 15 13 12 19 18 17 16 20 
12 18 20 16 15 19 13 17 14 11 
14 17 16 19 20 18 12 11 15 13 
3 8 2 7 6 4 5 1 10 9 
8 5 3 2 4 1 7 9 6 10 
2 4 10 3 1 8 5 9 6 7 
5 10 3 2 1 6 9 4 8 7 
2 10 9 7 5 8 1 4 6 3 
4 3 6 2 5 10 7 8 9 1 
1 5 9 4 2 7 3 6 8 10 
9 1 4 8 7 3 2 10 6 5 
6 9 10 7 3 4 8 2 1 5 
7 4 5 8 10 1 9 3 2 6 
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forbidden 2 12
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