#gas_main__gasmain  a main that distributes gas
  supertype:  main  a principal pipe in a system that distributes water or gas or electricity or that collects sewage
  part of:  gas_system__gassystem  facility (plant and equipment) for providing natural-gas service
     part of:  infrastructure__base  the stock of basic facilities and capital equipment needed for the functioning of a country or area; "the industrial base of Japan"

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