#graphite__black_lead__blacklead__plumbago  used as a lubricant and as a moderator in nuclear reactors
  supertype:  #carbon__C__atomic_number_6  an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
  subtype:  #pencil_lead__lead  mixture of graphite with clay in different degrees of hardness; the marking substance in a pencil

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