Sentence:Williams, who is regarded as "the first among equals" within the [e1]communion[/e1] of [e2]leaders[/e2] that represent 160 countries and some 75 million Anglicans worldwide, has sought to find a delicate balance within the deeply divided group of primates.
 e1: communion. 
 e2 : leaders.
Answer: Member-Collection(e2,e1)