Category:Language articles with invalid population dates
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This category is triggered if something other than a purely numerical value is entered in the date field of a language infobox. (Note that this does not happen if a merely unlikely date is entered.) An invalid input affects the display of the infobox as well as its ability to detect obsolete data.
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Entering 'NA' or 'no date' in the date field triggers a subcategory. Though it does not cause any problems with display, it does prevent the obsolescence calculation.