Is the preposition "of" necessary in the phrase "outside their comfort zone"?
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It's usually one or the other of "out of their comfort zone" or (less commonly) "outside their comfort zone".– FumbleFingersCommented Mar 3, 2014 at 23:08
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possible duplicate of "Outside" or "outside of"? Or “Out of” vs “outside” of city– FumbleFingersCommented Mar 3, 2014 at 23:09
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