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