It's a pretty common feature for anything that digs through disks. Quite a few options if you google dupe finder or similar. <a href="http://zabkat.com/x2down.htm">xplorer2</a> does a good job. The free version doesn't include dupe finding, but the pro version is free for 3 weeks. Might do what you need.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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