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