anchor.diff:  ABERFELDY,1887
   TURRIFF,1888
   RUGELY,1889
  +AYTON,18905
  +AYTON,18906
  +AYTON,18907
  +AYTON,18909
  +COLDSTREAM,18902
  +COLDSTREAM,18903
  +COLDSTREAM,18904
  +COLDSTREAM,18908
   TUNBRIDGE WELLS,1892
   UXBRIDGE,1895
   GALASHIELS,1896
  
positive.code: COOKSTOWN,2886
  DUNGANNON,2887
  FIVEMILETOWN,2889
  BANGOR(CO. DOWN),2891
  LISBURN,2892
  BALLYCLARE,2893
  ANTRIM,2894
  BELFAST,2895
  SAINTFIELD,2897
  MILLOM,12293
  MILLOM,12297
  BARROW-IN-FURNESS,12298
  BALLATER,13397
  ABOYNE,13398
  LANGHOLM,13873
  STANHOPE,13885
  BISHOP AUCKLAND,13887
  BOROUGHBRIDGE,14233
  HARROGATE,14237
  NORTH CAVE,14304
  MARKET WEIGHTON,14308
  BELLINGHAM,14342
  HALTWHISTLE,14343
  HEXHAM,14346
  HEXHAM,14347
  CLYNDERWEN,14375
  HAVERFORDWEST,14377
  SPILSBY,15072
  ALFORD (LINCS),15074
  LOUTH,15076
  HORNBY,15242
  HAWKSHEAD,15394
  GRANGE-OVER-SANDS,15395
  SEDBERGH,15396
  LLANIDLOES,16864
  NEWTOWN,16866
  WIGTON,16973
  RAUGHTON,16974
  APPLEBY,17683
  POOLEY BRIDGE,17684
  KESWICK,17687
  SPILSBY,17907
  TONGUE,18476
  THURSO,18478
  STORNOWAY,18515
  GREAT BERNERA,18516
  STORNOWAY,18518
  AYTON,18907
  COLDSTREAM,18908
  GOSFORTH,19467
  HORNSEA,19642
  PATRINGTON,19646
  ALFORD (ABERDEEN),19755
  STRATHDON,19756
  FOULA,159575
  FAIR ISLE,159576
  
negative.code: PORTHMADOG,1766
  SANDY,1767
  PENRITH,1768
  APPLEBY,17683
  POOLEY BRIDGE,17684
  KESWICK,17687
  SOUTH MOLTON,1769
  ISLE OF ARRAN,1770
  MAUD,1771
  