A compound is designed to use more than one of the above form is not that it is a mix between a Front facing or Rear facing to Front facing or Booster with a 3.
Composite designed for use in more than one model above is a mix between the Front facing Rear facing or Front facing both the Booster or a third also.
The mixed design to use more than 1 model above, no matter is a mix between Rear facing with Front facing or Front facing. With Booster or use both 3 model also.