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Term 1: Term 2:

(subclass PetroleumProduct Oil) Mid-level-ontology.kif 1677-1677 Petroleum product is a subclass of oil
(subclass FossilFuel PetroleumProduct) Mid-level-ontology.kif 1688-1688 Fossil fuel is a subclass of petroleum product
(subclass Petroleum PetroleumProduct) Economy.kif 5684-5684 Petroleum is a subclass of petroleum product
(subclass RefinedPetroleumProduct PetroleumProduct) Economy.kif 5929-5929 Refined petroleum product is a subclass of petroleum product


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