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Relation: subclass

Substance490An Object in which every part is similar to every other in every relevant respect. More precisely...^
    Fuel7Fuel is the class of Substances that can be used as resources in Combustion processes in order to...^
        FossilFuel5FossilFuel is the subclass of Fuel whose instances are derived from fossilized organic deposits...^
        Charcoal.A Fuel that is created by Combustion of Wood in a low Oxygen environment.^

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