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Dissolve yeast in warm water in large bowl. Add buttermilk, sugar, butter, eggs, baking powder, salt and 2 1/2 cups of the flour. Beat with electric mixer on low speed 30 seconds, scraping bowl constantly. Beat on medium speed 2 minutes, scraping bowl occasionally. Stir in enough remaining flour to make dough easy to handle. (Dough should be soft and slightly sticky.)