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