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