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