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-- Google AdSense
---- Googlebot-MediaPartners special bot for adsense.
BigDave - 3:18 am on Apr 26, 2006 (gmt 0)Thread source:: http://www.webmasterworld.com/google_adsense/13657.htm
Because it serves a different purpose and you might want to allow one type of bot to have access to some pages and not to others.
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