In a medium mixing bowl, combine 3 cups flour, ¼ cup sugar, the salt, baking powder and baking soda, and whisk to incorporate. Working quickly, rub the cold butter into the dry mixture using your fingers or a pastry cutter. Cut the butter into the flour until the pieces are the size of small pebbles. (Alternatively, use a food processor to pulse the dry ingredients with the butter, to cut the butter.)
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