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