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google almost considers every webmaster bad until you prove them you are not bad. i haven't heard about duplicate filter issues with adsense, but i know it's an issue with search results. for example, they (google) considered site . com and www . site . com as duplicate content on some sites and would actually penalize them. they released what was labeled 'big daddy' which was supposed to combat that, but they seem to have more problems than any other engine. it just sucks because they send the most traffic.
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