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Melt butter; stir in brown sugar, corn syrup and salt. Bring to a boil, stirring constantly, then boil, without stirring for 5 minutes.
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Remove from heat, stir in soda and vanilla.
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Gradually pour over corn, mix well.
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Turn into two large, shallow baking pans.
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Bake at 250 degrees F for 1 hour, stir every 15 minutes.
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Remove from oven, cool completely.
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Break apart and store in tightly covered containers.