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