A9.com

A9.com, which went live on April 14, 2004, is an Internet search engine from  Amazon.com. Its results derive from Live Search, supplemented by Alexa, Amazon.com and other engines for specific search types.A9 has many features which many popular search engines lack. In addition to generic web searching, A9 has the ability to search the book results from Amazon.com that include "Search Inside the Book" (as long as a user registers with Amazon.com). Its interface allows users to combine search results together, allowing side by side comparison of results.
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