Blend together until finely mixed: 2 cup all purpose flour, 2 cup brown sugar, and stick of margarine. Reserve 3/4 cup crumb mixture for topping. Add balance of flour mixed with soda, salt, and cinnamon. Add buttermilk, vanilla, and egg; do not over mix. Place in buttered 9x13 inch pan, and sprinkle on topping. Bake at 350 degrees for 30 minutes.
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