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