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