#eraser  an implement used to erase something
  supertype:  #implement  instrumentation (a piece of equipment or tool) used to effect an end
  subtype:  #blackboard_eraser  an eraser that removes chalk marks from blackboard
  subtype:  #ink_eraser__inkeraser  an eraser that removes ink marks
  subtype:  #rubber_eraser__rubber__pencil_eraser  an eraser made of rubber (or of a synthetic material with properties similar to rubber); commonly mounted at one end of a pencil

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