Sentence:It is a leaderless organization, although there is an "inner" [e1]ring[/e1] of [e2]partners[/e2], and an "outer" ring of additional members that are associated with the WikiRing, but have limited rights with regards to voting and access to shared resources.
 e1: ring. 
 e2 : partners.
Answer: Member-Collection(e2,e1)