title: Copying the contents of an NSMutableDictionary into another NSMutableDictionary?
body: <p>I have an <code>NSMutableDictionary</code> each element of which is another dictionary. What is the best way I can copy its contents into another <code>NSMutableDictionary</code>? I've tried using:</p>
  
  <pre><code>firstDictionary = [NSMutableDictionary dictionaryWithDictionary:secondDictionary];
  </code></pre>
  
  <p>However not sure if this is the best way to do it.</p>