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