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