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16 ounces frozen blackberries, or canned
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2 1/2 tablespoons cornstarch
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1 tablespoon lemon juice
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1 cup white enriched flour
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1 cup whole wheat flour
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2 cups quick cooking oats
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1 cup brown sugar
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1 1/4 teaspoons baking powder
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3/4 teaspoon salt
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1/2 teaspoon ground allspice
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1 teaspoon cinnamon
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1 cup butter or margarine
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