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Relation: subclass

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Oil33A greasy, viscous CompoundSubstance that cannot be mixed with Water. Note that this general cla...^
    PetroleumProduct11PetroleumProduct is a broad class that includes both crude oil (Petroleum) and RefinedPetroleum...^
        FossilFuel5FossilFuel is the subclass of Fuel whose instances are derived from fossilized organic deposits...^
        Petroleum.Petroleum is commonly known as crude oil. It is a thick, dark brown or greenish flammable liquid, w...^
        RefinedPetroleumProduct4A Substance that is the result of the Distilling of Petroleum.^

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