In a mixing bowl, dissolve yeast in water. Beat in the buttermilk, oil, sugar, salt, baking soda and 2 cups of flour until smooth. Stir in enough remaining flour to form a soft dough. Turn onto a floured surface; knead until smooth and elastic, about 6-8 minutes. Place in a greased bowl, turning once to grease top. Cover and let rise in a warm place until doubled, about 1-1/2 hours.
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