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Relation: subclass

DigitalDataStorageDevice12An instance of DigitalDataStorageDevice is an ElectronicDataStorageDevice intended to be used...^
OpticalDisc3This Class comprises several subclasses of disc-shaped data storage devices. Unless otherwise i...^
    DVD.An instance of DVD (Digital Versatile Disk) is a disc-shaped DigitalDataStorageDevice similar...^

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