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