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