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