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Joined: October 18, 2012
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Comments posted: 1
Votes received: 9
Retired English Teacher: I believe your rule applies only to numbers (in numeral form, not spelt out) and single letters, not words. So your first example (3's) is correct, but your second (that's) isn't. It's yeses.
October 18, 2012, 2:32am
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