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