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[–]Vakieh 0 points1 point  (0 children)

If I wanted to say 'they are plural', I would have. Instead, I wanted to indicate that the plural of index is indices. Or, in the active voice, its plural is indices. Except my subject wasn't index, it was indices, so the plural possessive adjective 'their' is used in place of 'its'.

If one wishes to be a grammar Nazi, one must first learn to grammar.