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