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In large bowl, mix 1 1/2 cups of the all-purpose flour, the mashed potatoes (dry), brown sugar, salt, 3/4 teaspoon caraway seed and the yeast. In 1-quart saucepan, heat buttermilk, water and oil over medium heat, stirring frequently, until very warm (120°F to 130°F); stir into potato mixture until blended. Stir in rye flour and enough remaining all-purpose flour to make dough easy to handle.