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