I have a site which has 20000 pages that are focused on specific areas, but the central paragraphs are all the same. We've started dropping down the rankings recently, and it's been suggested that the duplicate content is seen as doorway pages to the main site. And we are been pnalised for duplicate content. What I'm thinking is take the central paragraphs, and shuffle all the words, so that the keywords are all still their, when a bot reads it, but display the real content to browsers. Will this work??