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Relation: subclass

direct-childrendocumentationgraph
ContentBearingObject365Any SelfConnectedObject that expresses content. This content may be a Proposition, e.g. when th...^
    GreetingCard1a rectangular piece of stiff paper used to send messages - may have printed greetings or pictures.^
        HolidayCard.A stiff piece of Paper, usually folded over, which is sent to others in celebration of a Holida...^

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