anchor.diff:  "Congo, Republic of the",COG,COG
   Republic of the Congo,COG,COG
   "Congo, the Democratic Republic of the",COD,COD
  +Democratic Republic of the Congo,COD,COD
   Cook Islands,COK,COK
   Côte d'Ivoire,CIV,CIV
   Curaçao,CUW,CUW
  
positive.code: Sint Maarten (Dutch part),NULL,SXM
  South Georgia and the South Sandwich Islands,NULL,SGS
  South Vietnam,NULL,*SV
  South Yemen,NULL,*SY
  Southern Africa (not specified),?SF,?SF
  SPRATLY ISLANDS [UNDETERMINED],NULL,~PG
  St. Kitts and Nevis,KNA,KNA
  St. Lucia,LCA,LCA
  St. Vincent and Grenadines,VCT,VCT
  Sub-Saharan Africa (not specified),NULL,?AH
  Svalbard and Jan Mayen,NULL,SJM
  Syrian Arab Republic,SYR,SYR
  
negative.code: FRENCH POLYNESIA,PYF,PYF
  FSM,FSM,FSM
  FSM: MICRONESIA (FEDERATED STATES OF),FSM,FSM
  Federated States of Micronesia,FSM,FSM
  GAB,GAB,GAB
  GAB: GABON,GAB,GAB
  GABON,GAB,GAB
  