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