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Thanks for sharing this. I didn't know that it was submitted earlier. Should I remove this or not?
It's polite to check first.

Use the Search at the bottom of the page, then sort by date (descending) - it's easy to see what other articles use that keyword.

There's a dupe-recognition attempt at post time, but it doesn't yet catch cases like sites that append crap to URLs to make them artificially unique.