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Relation: subclass

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FossilFuel5FossilFuel is the subclass of Fuel whose instances are derived from fossilized organic deposits...^
Solution8A liquid mixture. The most abundant component in a solution is called the solvent. Other components...^
    Gasoline.Gasoline is the subclass of RefinedPetroleumProducts that are fuels for internal combustion engin...^

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