Help me here - what is a serial comma? This is a comma to me ","
I wonder if you are talking about what I call an apostrophe " ' "?
It is acceptable here to use an apostrophe when using plurals of acronyms, where the meaning could otherwise me misunderstood - especially the case in capital fonts for example those used by supermarkets. So while it is incorrect for a greengrocer to write "Pear's on Sale," it is acceptable for Tesco to advertise "ALL DVD'S & CD'S 50% OFF!"
Sorry if we're talking at cross purposes.
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