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