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12-12-2015
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What is the proper way to write the plural of a single letter? (another apostrophe question)

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WorldCitizen WorldCitizen

14-12-2015

for capital letters, we can just add the ending -s, for example:

I got As in the final exam.

for lower-case letters, an apostrophe is used to avoid confusion:

In the multiple-choice exam all the correct answers happened to be a's! (as in: option a)

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