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