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