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