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Relation: subclass

PhysicalSystem25PhysicalSystem is the class of complex Physical things. A PhysicalSystem may have one or more...^
    TransitSystem7A TransitSystem is a system of interconnected Transitways over which some type(s) of vehicles o...^
        RailTransportationSystem1RailTransportationSystem is the subclass of TransitSystems whose routes are Railways.^
        RoadTransportationSystem.RoadTransportationSystem is the subclass of TransportationSystems whose routes are Roadways.^
        UniModalTransitSystem.UniModalTransitSystem is the class of TransitSystems that accommodate a single type of transpor...^
        MultiModalTransitSystem.MultiModalTransitSystem is the class of TransitSystems that accommodate more than one type of t...^

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