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