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