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