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