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In the "Chrome" Browser, "theater" is spelled correctly and "theatre" is spelled incorrectly. However in Word it is "theatre" that is correct and "theater" that is incorrect.
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Similarly with "humor" and "humour" .
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And, funny enough, "spelt" is correct in British and incorrect in American English.
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Now, as anyone that knows me knows, I can't spell or proof even when I have the right dictionaries, so imagine the difficulties now!
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Just muddle through ya'll.