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