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Google not only indexes and caches web pages but also takes " snapshots" of other file types, which include PDF, Word documents, Excel spreadsheets, Flash SWF, plain text files and much more. Except in the case of text and SWF files, the cached version is a conversion to (X)HTML , allowing those without the corresponding viewer application to read the file.
Users can customize the search engine, by setting a default language, using the "SafeSearch" filtering technology and set the number of results shown on each page. Google has been criticized for placing long-term cookies on users' machines to store these preferences, a tactic which also enables them to track a user's search terms and retain the data for more than a year. For any query, up to the first 1000 results can be shown with a maximum of 100 displayed per page