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