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