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