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