title: CoreData RelationShips
body: <p>Working environment: OS X 10.6.3, Xcode 3.2.1 <br />
  Hi! I'm working on a project called Rent-a-Flick. The project has two entities: Movie and Client. Between them there's a many-to-many relationship. <br />
  I have 2 tables: one with the movies and one with the clients. Their content is bound to the proper array controllers(for movie and client). <br />
  I want to add a third table in which only the clients that rented a selected movie will appear. I should also be able to add/remove clients from this table. How can I do that without creating duplicates? <br />
  The project is open source. I'll publish it as soon as I make a stable release.</p>