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