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