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Search engines scan for this Seo trick by calculating each page's keyword density and penalizing pages whose density falls above a target range. The target range has been falling lower and lower for the past several years. To avoid being penalized for having too high a keyword density, read webmaster forums to keep track of the current desirable density, and rework your pages when their keyword density is too high. Webmasters with a little more technical skill use "doorway pages" to show specially optimized pages to search engines, instead of showing them the less optimized pages that human viewers see. Doorway pages are strongly penalized.