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