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