#blade.cutting_implement  the flat part of a tool or weapon that (usually) has a cutting edge
  supertype:  #cutting_implement__cuttingimplement  a tool used for cutting or slicing
  part:  #knife_edge
  part of:  #ax  #knife  #lawn_mower  #pair_of_scissors  #spatula  #spatula.food_turner  #sword
  subtype:  #knife_blade__knifeblade  the blade of a knife
  subtype:  #razorblade  a blade that has very sharp edge

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