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