Someone wrote me 5 articles. However, I noticed the articles are not 100% unique. some paragraphs are repeats. for example, he took a paragraph from article 1 and inserted it into article 5. I need a tool where I can paste all these articles and find out which paragraphs are repeats. I guess what I need is a article uniqueness checker? There are only 5 articles. I would prefer to compare them all at the same time, but 2 at a time is also ok. any free programs for this?