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