#sewer_main__sewermain__sewer_line__sewerline  a main in a sewage system
  supertype:  #main  a principal pipe in a system that distributes water or gas or electricity or that collects sewage
  part of:  #sewage_system__sewer_system__sewersystem__sewage_works  facility consisting of a system of sewers for carrying off liquid and solid sewage
     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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