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During the past generation, the American middle-class family that once could count on hard work ...

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becomes   became   has become   had become  
Though    Before    If    Unless  
equal division during sperm generation  abnormal mitosis during merogenesis (fertilized egg cleavage)  meiosis in embryo  meiosis when sperm is tailed  
of which    of what    of that    what  
permanent  powerful  striking  practical  
the past 30 million  the past 40 million  the past 50 million  the past 10 million  
How  What  How a  What a  
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permanent  powerful  striking  practical  
that    of that    of what    what  
of which    of what    of that    what  
permanent  powerful  striking  practical  
of what  of that  what  that  
permanent  powerful  striking  practical  

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