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Relation: subclass

CompactDisc3An instance of CompactDisc is a flat, disc-shaped DigitalDataStorageDevice that has a reflect...^
ReadOnlyMemoryDataStorage1A DigitalDataStorageDevice on which it is not possible to write or alter any DigitalData except...^
    CD-ROM.An instance of CD-ROM is a CompactDisc in the CompactDisc-ReadOnlyMemory (CD-ROM) format, whi...^

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