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