Create code to show the unique percentage of an article

Hi, As per some requests to explain what this job is about. We are just looking for you to modify the code we already have here: <[login to view URL]> its a simple php page that requires you to create a formula to determine the unique percentage of the article. We've had estimates that it should take 1-3 hours for a php coder. To see the code you have to signup here: <[login to view URL]> --- We have a website that requires a user to put in an article with spinner syntax like this. "The {dog|cat|horse|monkey|sheep} ran across the {road|street|avenue|park}." We need you to create code that will show the unique percentage of the article. It's very similar to the unique percentage function in the best spinner and spinner chief and any article rewriting software. Our website is coded in php. This should be a very simple project for the right coder. Thanks for reading