How to get around Itunes removing duplicate tracks from a playlist?

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Main point: I have created several playlists with multiple duplicate entries, and Itunes seams to remove them after the first time around. How do I avoid this? FAQ: Why would you want duplicate entries in a playlist? These duplicate entries are radio imaging spots that rotate through out an hour. Of course, Itunes sees these as music tracks, because it does not differentiate between the two. Any assistance is appreciated.