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There have been a variety of questions that shouldn't be allowed under current site rules because they are very clearly lacking basic research - 2 minutes on google would probably help them with their question. It seems clear to me that they should be closed, but I am not sure for which reason to flag, I've had a few flags declined recently for incorrect use and wish to avoid this in the future

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marked as duplicate by John Rennie, Kyle Kanos, AccidentalFourierTransform, David Z Mar 28 '18 at 18:02

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