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There's a gray area when it comes to grey vs. gray (pun intended). Here's where the difference comes from and when to use each.
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English. Как правильно по-английски: grey или gray (и дело не только в британско-американских различиях), English - The ELN Zen Channel - Английский
Reader's Digest
Doesn't understand there are two correct spellings of gray/grey : r/facepalm
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