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