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