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