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#1
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![]() $2 5,7/5,7/all
$2 4/5,7/5,7 |
#2
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![]() 7/1,2,3,4,5,6/1,2,3,4
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#3
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![]() $1...........4----1 5 6 7----1 5 6 7
$4...........4----5---------1 6 7 |