#rocking_chair__rockingchair__rocker  a chair mounted on rockers
  supertype:  #chair  a seat for one person, with a support for the back
  subtype:  #Boston_rocker  #platform_rocker  #shoofly
  part:  #rocker  a curved support that permits the supported object to rotate to and fro
  part:  #rung__round__stave  a crosspiece between the legs of a chair

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