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Relation: subclass

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PhysicalSystem25PhysicalSystem is the class of complex Physical things. A PhysicalSystem may have one or more...^
    EngineCoolingSystem2A system designed to keep the engine cool (and therefore prevent it from seizing), that may also he...^
        LiquidEngineCoolingSystem.A kind of EngineCoolingSystem found in most Automobiles, that uses a liquid coolant to cool the...^
        AirEngineCoolingSystem.A kind of EngineCoolingSystem less commonly found in Automobiles than a LiquidEngineCoolingSy...^

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