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