One of my favorite free resources is Dupe Free Pro .  Dupe Free Pro is a great little piece of software that instantly tells you how much duplicate content is in a rewritten article.  It works great.  I literally use it every day.

I love it because I can put the content that is my source in one pane and rewrite it in the other.  It saves me a ton of time flipping back and forth between what I’m writing and my research material.

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