anchor.diff:  Congo (brazzaville),COG,COG
   Congo (kinshasa),COD,COD
   "Congo, Democratic Republic of",COD,COD
  +Democratic Repubic of the Congo,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
  
positive.code: EL SALVADOR,SLV,SLV
  ELSALVADOR,SLV,SLV
  Eq Guinea,GNQ,GNQ
  EQUATORIAL GUINEA,GNQ,GNQ
  ERITREA,ERI,ERI
  ESP,ESP,ESP
  
negative.code: Sint Maarten,NULL,MAF
  SLB,SLB,SLB
  SLB: SOLOMON ISLANDS,SLB,SLB
  Soloman Islands,SLB,SLB
  SLE,SLE,SLE
  SLE: SIERRA LEONE,SLE,SLE
  SLOVAKIA,SVK,SVK
  