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