The Truth About Google Supplemental Results - Just like in...
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Just like in the title and description tags, using duplicate content text in several different pages will probably result in inclusion in the supplemental index. Web pages with little or no text content is another candidate for the supplemental index; image tags, prices and small descriptive text do not normally count as Google generally considers these as commercial page contents, destined for…you guessed it: the supplemental index. Long url's or url's with lots of dashes are also generally thought of as spam by Google which is the reason why many pages hosted by free sites end up in the supplemental index.
Aside from your web page's text content, another important factor is the actual structure of your website; an orphaned page (one that is not linked from your site or others) and pages with poor or no backlinks may be relegated to the supplemental index, along with pages that are nested several pages deep in your web site. Pages such as these are thought by Google to be of lesser importance than better-designed sites, so off to the supplemental index they go.
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