Sentence:Last month, police fired shots into the air at a soccer game in eastern Congo, attempting to break up a [e1]melee[/e1] of [e2]rioters[/e2] who believed one of the players was a witch: 15 fans died from trampling.
 e1: melee. 
 e2 : rioters.
Answer: Member-Collection(e2,e1)