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