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