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Preheat oven to 350 degrees. Grease a 9x13" pan.
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Melt shortening in a large saucepan over low heat, then stir in cocoa. Remove from heat.
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Mix in sugar and vanilla then mix in eggs one at a time. Stir in the remaining ingredients then stir in nuts.
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Bake for 30 minutes.
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Cool completely, before cutting into 2x2" squares.