title: How can one sort an NSMutableArray of NSMutableArrays containing NSStrings?
body: <p>Is there an easy way to sort an NSMutableArray of NSMutableArrays containing NSStrings?</p>
  
  <p>I am sure that there must be an easy method for doing this but I can't seem to find it.</p>
  
  <p>To Clarify I want to sort the first array alphabetically by the NSString at index 3 of the sub array.</p>