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Working with smart playlists in iTunes - Australian Macworld
http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNE2f7RhwFlndmoSvCxToQVbSVAomQ&url=http://www.macworld.com.au/help/working-with-smart-playlists-in-itunes-59445/