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were put forward due to scientists' recommendations came into being as a result of the workers' demand were introduced because quite a number of people were killed or seriously injured were effective enough to protect workers and customers
deeply; deep deep; deeply deeply; depth deep; deepen
Only; did the workers decide Not until; the workers decided Not until; did the workers decide Only after; the workers decided
all of what all of which all of them all of whom
data from the University of Chicago a recent history of the meat-packing industry social workers historical sources for the late nineteenth century
work working to work worked
most of who were workers most of whom were workers most of them were workers most of which were workers
to take to have taken having taken taking
data from the University of Chicago a recent history of the meat-packing industry social workers historical sources for the late nineteenth century
burst planted submitted distributed
were put forward due to scientists’ recommendations came into being as a result of the workers’ demand were introduced because quite a number of people were killed or seriously injured were effective enough to protect workers and customers
trapped were trapping had trapped had been trapped