All

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 J01 Technology, Industry, and Agriculture D013676 +
  J01.937 Transportation D014186 +
   J01.937.285 Aviation D001359 +
    J01.937.285.100 Aircraft D000401 +
     J01.937.285.100.100 Air Ambulances D017732 
 N02 Health Care Facilities, Manpower, and Services D005159 +
  N02.421 Health Services D006296 +
   N02.421.297 Emergency Medical Services D004632 +
    N02.421.297.879 Transportation of Patients D014187 +
     N02.421.297.879.100 Ambulances D000552 +
      N02.421.297.879.100.100 Air Ambulances D017732