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by zeckalpha 3990 days ago
Duplicate content is de-duplicated to an extent. Oftentimes, if I forget where the HN story that corresponds to a page I'm reading, I resubmit it, and HN redirects me to the HN story.

I believe this is time-boxed by a few weeks, which allows for things like "Something interest from the past (2008)" to get posted again.