title: Using an NSPredicate to tell if an NSSet contains objects from another NSSet
body: <p>I have a Core Data object that has an NSOrderedSet of Core Data objects in it called hierarchyItems. I want to create a fetch request that will check to see if the hierarchyItems set contains an object that is also in another NSMutableSet of Core Data objects.I would like to create a NSPredicate or NSExpression that has the same functionality as</p>
  
  <pre><code>[obj.hierarchyItems intersectsSet: setOfItems];
  </code></pre>