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