anchor.diff:  NE,Niger
   NG,Nigeria
   NU,Niue
  -NF,Norfolk Island
  -MP,Northern Mariana Islands
   NO,Norway
   OM,Oman
   PK,Pakistan
  
positive.code: LC,Saint Lucia
  WS,Samoa
  SM,San Marino
  ST,Sao Tome and Principe
  SA,Saudi Arabia
  SN,Senegal
  RS,Serbia
  
negative.code: AF,Afghanistan
  AL,Albania
  DZ,Algeria
  AD,Andorra
  AO,Angola
  AI,Anguilla
  