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The ``pack-names`` file gives the list of all finished non-obsolete
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packs. (This should always be the same as the list of files in the
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that can't easily list directories, and it includes other information.)
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The constraint on the ``pack-names`` list is that every file mentioned
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In rare cases, when a writer is interrupted, about-to-be-removed packs
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may still be present in the directory but removed from the list.