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