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