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Examples
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But in this case, known as fetus-in-fetu, the body of one twin envelops the other.
USATODAY.com News 2012
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Couldn't Tyler Hamilton's dog's doping phantasmagorical fetus-in-fetu twin be located in time for a couple soundbites?
The Indignity of Commuting by Bicycle: Bike Month Round-Up BikeSnobNYC 2008
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