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