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