#butterhead_lettuce  lettuce with relatively soft leaves in a loose head; easily broken or bruised
  supertype:  #lettuce  leaves of any of various plants of Lactuca sativa
  part of:  #head_lettuce
  subtype:  #buttercrunch  lettuce with delicate and relatively crunchy leaves
  subtype:  #Bibb_lettuce  lettuce with relatively crisp leaves
  subtype:  #Boston_lettuce  lettuce with relatively soft leaves

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