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Preheat oven to 350°.
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Combine flour, sugar and butter for crust and mix well.
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Pat firmly into 13 x 9 pan and sprinkle pecans on top.
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For caramel layer, in a heavy saucepan over medium heat, cook butter and sugar, stirring constantly.
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Boil for 1 minute, then pour evenly over crust.
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Bake for 25 minutes or until layer is bubbly.
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Remove from oven and immediately sprinkle chocolate chips over top.
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Allow to melt for about 2 minutes, then stir for marble effect.
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Cool completely for several hours before cutting.