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Since "400 level" should be hyphenated as "400-level", should "300 or 400 level" be hyphenated as "300- or 400-level," or is there another way to write this?

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"300- or 400-level" is correct. However, if you have "to" in between, I would write it as "300-to-400 level" or "300-to-400-level".

hguler
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  • Indeed; that's why I edited the original version (I meant to write 'or' and not 'to'). – Pietro Paparella Feb 28 '19 at 23:39
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    I think you removed one "to" but not the other. It's still in "300 to 400 level." That's why I wasn't sure whether you meant to use "or" or "to." – hguler Feb 28 '19 at 23:41