anchor.diff:  1GA, Chevrolet
   1GB, Chevrolet
   1GC, Chevrolet
  -1GM, Pontiac 
  +1GM, Pontiac
   1GN, Chevrolet
   1GD, GMC
   1GE, Cadillac
  
positive.code: ZCG, Cagiva
  ZDC, Honda
  ZDF, Ferrari
  ZD0, Yamaha 
  ZD3, Beta Motor
  ZD4, Aprilia
  ZDM, Ducati
  
negative.code: WDB, Mercedes-Benz
  WDC, Mercedes-Benz
  WDD, Mercedes-Benz
  WDF, Mercedes-Benz
  WDP, Dodge
  WDX, Dodge
  WDY, Dodge
  