Merging of rss feeds and sorting out duplicates?

ender February 14, 2010
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I have subscribed to many rss feeds, but some of the blogs are sometimes linking to the same content.
Is there an online or offline service, that does let me merge those feeds, and knows which articles are duplicates, and just show me one of the feeds?
I know makeuseof has featured several online services to merge rss feeds, but I think, I found none, that has the duplicate detection.
thanks in advance for any help.

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