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