In the novel, "HOLES" by Louis Sachar, it states, "Vacancies don't last long at Camp Green Lake." . This means that openings at Camp Green Lake do not last long, and there is always someone new filling in an open spot.
Americanliterature.com/author/mark-twain/short-story/the-killing-of-julius-caesar-localized
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What book is it you need to be more specific