Quote:
Originally Posted by Graham
Edit: this site says that the apostrophe can be used with abbreviations, numbers or letters only where its use is helpful and unambiguous:
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I was taught it was a hard rule, but honestly it isn't one that really helps with understanding. It always feels like its trying to express possession instead of plurality.
Then again, my recent argument with Catlady shows just how many ways there are to teach grammar and basic writing. One textbook's hard rules are another's recommendations and not even mentioned in a third.