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Relation: subclass

Region1345A topographic location. Regions encompass surfaces of Objects, imaginary places, and Geograph...^
    FlowRegion20FlowRegion is a class of things whose boundaries are relatively stable but whose constitutive m...^
        AirStream3AirStream is the class of FlowRegions that consist of air.^
        StreamWaterArea8A relatively narrow WaterArea where the water flows constantly and in the same direction, e.g. a ...^
        WaterCurrent5WaterCurrent is a subclass of FlowRegions consisting of moving water, especially those currents...^
        Tide.A Tide is a vertical movement of the water level in a BodyOfWater due to the gravitational attr...^

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