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