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