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