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Regenerate directories
Before opening the directories for last names, first names, places, professions, and the directory of all persons, the program checks whether the number of entries in the directory exactly matches the number of respective objects in the database. If this is not the case, the program offers to regenerate the directory. You can also regenerate one of the aforementioned directories yourself at any time by selecting the "Regenerate" menu item from the directory's context menu.

During regeneration, the directory is rebuilt. This process can take a long time with a large number of entries.
References
Check file