anchor.diff:  "Alamosa, CO ",ALS
   "Al-Baha, Saudi Arabia ",ABT
   "Albany, NY ",ALB
  -"Albany, OR - Bus service ",CVO
  -"Albany, OR - Bus service ",QWY
   "Albuquerque, NM ",ABQ
   "Albury, Australia ",ABX
   "Alderney, United Kingdom ",ACI
  -"Aldershot, ON - Rail service ",XLY
   "Aleknagik, AK ",WKK
   "Aleppo, Syrian Arab Republic ",ALP
   "Alexander Bay, South Africa ",ALJ
   "Alexandria, Egypt ",ALY
   "Alexandria, LA ",AEX
  -"Alexandria,ON - Rail service ",XFS
   "Alexandroupolis, Greece ",AXD
   "Al-Fujairah, United Arab Emirates ",FJR
   "Alghero, Italy ",AHO
  
positive.code: "Guayaquil, Ecuador ",GYE
  "Guayaramerin, Bolivia ",GYA
  "Guaymas, Mexico ",GYM
  "Guelph, ON - Rail service ",XIA
  "Guernsey, United Kingdom ",GCI
  "Guerrero Negro, Mexico ",GUB
  "Guilin, China ",KWL
  
negative.code: "Neryjungri, Russia ",NER
  "Neuquen, NE, Argentina ",NQN
  "Nevis, St. Kitts and Nevis ",NEV
  "New Chenega, AK ",NCN
  "New Haven, CT ",HVN
  "New Koliganek, AK ",KGK
  