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