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