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