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Relation: subclass

TransitwayObstacle3TransitwayObstacle is the general class of Objects that can act as obstacles to Motion along ...^
Device984A Device is an Artifact whose purpose is to serve as an instrument in a specific subclass of ...^
    Door.An Artifact that restricts and permits access to a StationaryArtifact (e.g. Building or Roo...^

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