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Term 1: Term 2:

(subclass PetroleumLubricant RefinedPetroleumProduct) Economy.kif 5935-5935 Petroleum lubricant is a subclass of refined petroleum product
(subclass MotorOil PetroleumLubricant) Economy.kif 5939-5939 Motor oil is a subclass of petroleum lubricant


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