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