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