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