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