#rocking_chair__rockingchair__rocker  a chair mounted on rockers
  supertype:  chair  a seat for one person, with a support for the back
  part:  rocker  rung
  subtype:  Boston_rocker  a rocking chair that has a high spindle back and a decorative top panel
  subtype:  platform_rocker  rocking chair on a stationary base
  subtype:  shoofly  a child's rocking chair with the seat built between two flat sides that are shaped to resemble an animal (such as a swan or duck)

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