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