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: St Pierre & Miq,SPM,SPM
  St Vinc & Gren,VCT,VCT
  St Vincent + Gren.,VCT,VCT
  STP,STP,STP
  STP: SAO TOME AND PRINCIPE,STP,STP
  SUDAN,SDN,SDN
  
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
  