Sentence:Shigang Chen and Liman Wei, both of Santa Clara, Calif., and Partha Bhattacharya of Cupertino, Calif., have developed a method for removing redundancies from a [e1]list[/e1] of [e2]data structures[/e2].
 e1: list. 
 e2 : data structures.
Answer: Member-Collection(e2,e1)