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