Frankenstein restaurants are popping up everywhere, but they aren't actually that successful

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Frankenstein restaurants are popping up everywhere, but they aren't actually that successful

Multi-branded restaurants, like this combination Taco Bell-Pizza Hut, have been around for decades.Kevork Djansezian/Getty ImagesDine Brands is thinking about rolling out combination IHOP-Applebee's restaurants.But other chains have tried that before, with not a great deal of success.Running restaurants together relies on details like integrating kitchens.In 2008, Hip Hop trio Das Racist caught the attention of the internet with their song "Comb…