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