#carbide  a binary compound of carbon with a more electropositive element
  supertype:  #inorganic_compound__inorganiccompound  any compound that does not contain carbon
  subtype:  #calcium_carbide  a gray salt of calcium (CaC) used in making acetylene
  subtype:  #silicon_carbide__siliconcarbide  an extremely hard blue-black crystalline compound (SiC) used as an abrasive and a heat refractory material; crystals of silicon carbide can be used as semiconductors

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