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