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