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