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