anchor.diff:  EL SALVADOR,SLV,SLV
   ELSALVADOR,SLV,SLV
   Eq Guinea,GNQ,GNQ
  +Equitorial Guinea,GNQ,GNQ
   EQUATORIAL GUINEA,GNQ,GNQ
   ERITREA,ERI,ERI
   ESP,ESP,ESP
  
positive.code: Congo (brazzaville),COG,COG
  Congo (kinshasa),COD,COD
  "Congo, Democratic Republic of",COD,COD
  "Congo, Peoples Republic of the (Brazzaville)",COG,COG
  "CONGO,DEMOCRATIC REPUBLIC OF THE (KINSHASA)",COD,COD
  "CONGO,REPUBLIC OF THE (BRAZZAVILLE)",COG,COG
  
negative.code: Christmas Island,NULL,CXR
  Cocos (Keeling) Islands,NULL,CCK
  "Congo, Republic of the",COG,COG
  Republic of the Congo,COG,COG
  "Congo, the Democratic Republic of the",COD,COD
  Cook Islands,COK,COK
  Côte d'Ivoire,CIV,CIV
  