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