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