I think Yorktown means one or both of the following:
1. Include some random items on your pages along with other content. That way you may avoid duplicate filters because the chances of your pages being EXACTLY the same are reduced. Of course you need to have a decent amount of random text to make it worthwhile. A quote or headline here or there probably won’t make a big enough difference.
2. Use something like a thesaurus to change some of your words in the content. Sites run from datafeeds make use of this to differentiate them. Of course you need to ensure the content makes sense with each combination.