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the study of the past
people who study the past
in the past two years
in the previous study
the study of past events
a previous study has shown that
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two studies have been
compared to previous studies
previous study has demonstrated
several years ago i studied
detailed study over the past two, the study of the past, people who study the past, in the past two years, in the previous study, the study of past events, a previous study has shown that, study in simple past, two studies have been, compared to previous studies, previous study has demonstrated, several years ago i studied
