anchor.diff:  "NUTS_BE211","Arr. Antwerpen","Belgium","NUTS3"
   "NUTS_FRD21","Eure","France","NUTS3"
   "NUTS_FRF31","Meurthe-et-Moselle","France","NUTS3"
  -"NUTS_CH022","Freiburg","Switzerland","NUTS3"
   "NUTS_SE121","Uppsala län","Sweden","NUTS3"
   "NUTS_BE324","Arr. Mouscron","Belgium","NUTS3"
   "NUTS_CH011","Vaud","Switzerland","NUTS3"
  
positive.code: "NUTS_FRD13","Orne","France","NUTS3"
  "NUTS_FRB04","Indre-et-Loire","France","NUTS3"
  "NUTS_CZ051","Liberecký kraj","Czechia","NUTS3"
  "NUTS_FRY10","Guadeloupe","France","NUTS3"
  "NUTS_DK022","Vest- og Sydsjælland","Denmark","NUTS3"
  "NUTS_FRJ26","Hautes-Pyrénées","France","NUTS3"
  "NUTS_FRJ24","Gers","France","NUTS3"
  "NUTS_LT011","Vilniaus apskritis","Lithuania","NUTS3"
  "NUTS_CH055","St. Gallen","Switzerland","NUTS3"
  "NUTS_SE313","Gävleborgs län","Sweden","NUTS3"
  "NUTS_FRY20","Martinique","France","NUTS3"
  "NUTS_FI1D1","Etelä-Savo","Finland","NUTS3"
  "NUTS_FRJ25","Lot","France","NUTS3"
  "NUTS_FRJ15","Pyrénées-Orientales","France","NUTS3"
  
negative.code: "NUTS_FI1D3","Pohjois-Karjala","Finland","NUTS3"
  "NUTS_CZ071","Olomoucký kraj","Czechia","NUTS3"
  "NUTS_SE311","Värmlands län","Sweden","NUTS3"
  "NUTS_DK011","Byen København","Denmark","NUTS3"
  "NUTS_CH066","Zug","Switzerland","NUTS3"
  "NUTS_FRJ23","Haute-Garonne","France","NUTS3"
  