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