1 3 5 6 7 X Z M Hybrid
1 series 5 door 3 series seda 5 series sedan 5 series sedan 5 series Gran Turismo X1 Z4 roadster m sedan X6
1 series coupe 3 series coupe 7 series sedan 6 coupe     X6
1 series convertible 3 series convertible   5 series sedan     m3 coupe  
          X6   m3 coupe  
              m3 coupe