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