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 G03 Environment and Public Health D004778 +
  G03.230 Environment D004777 +
   G03.230.069 Cities D002947 

 Z01 Geographic Locations D005842 +
  Z01.433 Cities D002947 
    Z01.433.128 Berlin D001604 
    Z01.433.210 Boston D001900 
    Z01.433.305 Chicago D002641 
    Z01.433.429 District of Columbia D004219 
    Z01.433.553 London D008131 
    Z01.433.653 Moscow D009031 
    Z01.433.741 New York City D009519 
    Z01.433.800 Paris D010297 
    Z01.433.850 Rome D012384 
    Z01.433.875 San Francisco D012495 
    Z01.433.900 Tokyo D014041 
    Z01.433.565 Los Angeles D015141 
    Z01.433.100 Baltimore D015142 
    Z01.433.820 Philadelphia D015143