Directions:
In a small bowl, dissolve yeast in warm water and set it aside.
In a large bowl, blend flour, sugar, baking powder, baking soda, and salt.
Cut in butter and shortening until the mixture resembles coarse crumbs.
Add the yeast mixture and buttermilk, stirring just until the dough comes together.
On a floured surface, gently knead the dough 3-4 times.
Roll out the dough to a thickness of 1/2 inch and cut with a biscuit cutter.
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