#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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