#preventive__hindrance__hitch__preventative__encumbrance__interference  any obstruction that impedes or is burdensome
  supertype:  #obstructor__obstruction__obstructer__impediment__impedimenta  any structure that makes progress difficult
  subtype:  #clog  any object that acts as a hindrance or obstruction
  subtype:  #speed_bump__speedbump  a hindrance to speeding created by a crosswise ridge in the surface of a roadway

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