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Preheat oven to 350 degrees.
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Line a cookie sheet with foil and lightly grease.
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Place graham crackers on the cookie sheet in one layer.
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Sprinkle pecans evenly over the graham squares.
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In a small sauce pan melt the unsalted butter.
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Add brown sugar to the pan and stir until mixture begins to boil.
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Pour sugar mixture over pecans and graham squares.
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Bake in oven for 10 minutes.
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Remove pan from oven and place into freezer for 1 hour.
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Break bark into pieces while still cold.