In a small bowl, dissolve yeast in warm water. In a large bowl, combine flour, baking soda, baking powder, salt, and sugar; cut in shortening. Stir in yeast and buttermilk. Blend well. Turn onto a floured board; knead lightly. Roll out, cut, and place on greased baking pan. Let rise slightly. bake at 400 degrees for 12 to 15 minutes.
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