Sentence:In the 50s, as the postwar generation lived lives of "Leave It to Beaver," a [e1]subculture[/e1] of [e2]beatniks[/e2] and musicians was busy being "mischievous, irreverent, impulsive, drunken, and sex-obsessed," breaking the social mores that came along with Ike and the Baby Boom.
 e1: subculture. 
 e2 : beatniks.
Answer: Member-Collection(e2,e1)