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