If I want to make a lowercase abbreviation plural, how do I do it? I've found loads and loads of information about how to pluralise acronyms, written in uppercase, but nothing about lowercase abbreviations. It seems to me that the normal process of simply adding an s doesn't really work in this case?
Examples:
You should be more specific – don't use so many etc[PLURAL]
You need the documents with the following RefNo[PLURAL]
There are so many sic[PLURAL] in this quote it's ridiculous
(I realise that example 2 would be easily solved by simply writing reference numbers instead, but please humour me – if, for some reason, I have to use the abbreviation, then how would I pluralise it?)