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"*. – FumbleFingers Mar 03 '14 at 23:08
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possible duplicate of "Outside" or "outside of"? Or “Out of” vs “outside” of city – FumbleFingers Mar 03 '14 at 23:09