Sentence:The key to Thirteen's return to form is having Danny Ocean (Clooney) and his merry [e1]ratpack[/e1] of expert [e2]thieves[/e2] and con men reteam in Las Vegas, site of their original big score in Eleven.
 e1: ratpack. 
 e2 : thieves.
Answer: Member-Collection(e2,e1)