anchor.diff:  NICARAGUA,NIC,NIC
   NIGER,NER,NER
   NIGERIA,NGA,NGA
  -Niue,NULL,NIU
  +Niue,NIU,NIU
   NIUE [NEW ZEALAND],NIU,NIU
   NJUNI,~NJ,~NJ
   NLD,NLD,NLD
  
positive.code: Macao,MAC,MAC
  "Macedonia, the former Yugoslav Republic of",MKD,MKD
  Mainland Southeast Asia / the Indochinese Peninsula,NULL,~IC
  Mayotte,NULL,MYT
  Micronesia (Federated States of),FSM,FSM
  "Micronesia, Federated States of",FSM,FSM
  Middle East & North Africa (not specified),*ME,?ME
  "Moldova, Republic of",MDA,MDA
  Niue,NIU,NIU
  Norfolk Island,NULL,NFK
  North Korea,PRK,PRK
  North Macedonia',MKD,MKD
  
negative.code: "Saint Helena, Ascension and Tristan da Cunha",NULL,SHN
  Saint Martin (French part),NULL,MAF
  Saint Pierre and Miquelon,SPM,SPM
  Sint Maarten (Dutch part),NULL,SXM
  South Georgia and the South Sandwich Islands,NULL,SGS
  South Vietnam,NULL,*SV
  