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