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