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