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