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