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Relation: subclass

Object6059Corresponds roughly to the class of ordinary objects. Examples include normal physical objects, geo...^
    TransitwayObstacle3TransitwayObstacle is the general class of Objects that can act as obstacles to Motion along ...^
        Dam.Dam is the subclass of StationaryArtifacts that are walls built across a stream or river to hol...^
        Door.An Artifact that restricts and permits access to a StationaryArtifact (e.g. Building or Roo...^

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