anchor.diff:  YEM,YEM,YEM
   YEM: YEMEN,YEM,YEM
   YEMEN,YEM,YEM
  +Yemen Arab Republic,YEM,YEM
   Yemen (Aden),NULL,*SY
   Yugoslavia,^YG,^YG
   Yugoslavia89-92,^YG,^YG
  
positive.code: GEO: GEORGIA,GEO,GEO
  GEORGIA,GEO,GEO
  GERMANY,DEU,DEU
  Germany (FRG),DEU,DEU
  Germany DR,NULL,DDR
  GHA,GHA,GHA
  
negative.code: "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
  