title: NSArray - check if objects are in an array?
body: <p>I have 2 arrays. One is a large static group of 600 objects, the other is a small varying group of 10 objects.</p>
  
  <p>I want to take any common objects between the two groups and put them in a new array.</p>
  
  <p>So lets say the large group contains 600 objects named 1 to 600. The smaller group contains 9 objects: 1, 2, 3, 4, 5, 6, a, b, c. I want to be able to create a new array that contains the objects 1, 2, 3, 4, 5, 6.</p>
  
  <p>What is the best way to do this?</p>