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