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Use "plurals" in a sentence
"It's not mistaken (like apostrophes in plurals), ugly (like straight quotes in a non-typewriter font), or potentially confusing."
"Personally I prefer not to use apostrophes at all in plurals; one way to avoid them when counting words or letters is by enclosing the word or letter in quotation marks: ‘if’s, ‘p’s and ‘q’s."
"In honor of the most recent of my alma maters (please, no comments about Latin plurals), I must commend the Historic Pittsburgh project mounted by the University of Pittsburgh."