Excluding Duplicate Articles

I would love a feature that would exclude duplicate articles. For example if I am following local news, business news, and national new, and an article about DC’s job growth might hit all three subscriptions. However sometimes there are corrections or updates to a story so I would still want to see the newer version of that story. I am not a coder and I am sure someone can come up with a better idea but if there is a word count on the body of the page so that if the subject and the word count are equal to that of another story it would exclude all but one of the articles.