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