Sentence:This extensor [e1]mechanism[/e1] is composed chiefly of the quadriceps femoris (rectus femoris, vastus lateralis, vastus intermedius, vastus medialis), quadriceps tendon, [e2]patella[/e2], and patellar tendon.
 e1: mechanism. 
 e2 : patella.
Answer: Component-Whole(e2,e1)