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