title: How to add a value to an NSOrderedSet
body: <p>I'm using a NSOrderedSet to store the data in a Json server and do it that way because data arrives duplicated and I have to filter them to keep only one value. Now I need to add a value at the beginning of NSOrderedSet. I know how to add value to an NSArray, but not how to pass data from NSOrderedSet to the NSArray.</p>
  
  <p>This is an example of what I get from the server:</p>
  
  <pre><code>{(
      AMAZONAS,
      AMAZONAS,
      ANTIOQUIA,
      ANTIOQUIA,
      ARAUCA,
      "AREA EN LITIGIO",
      "AREA EN LITIGIO",
      ATLANTICO,
  )}
  </code></pre>
  
  <p>with NSOrderedSet sorts the data to avoid repeated as follows:</p>
  
  <pre><code>    deptoArray=[NSOrderedSet orderedSetWithArray:[_data valueForKey:@"Nombre"]];
  
  {(
      AMAZONAS,
      ANTIOQUIA,
      ARAUCA,
      "AREA EN LITIGIO",
      ATLANTICO,
  )}
  </code></pre>
  
  <p>but now I need to add a data at the beginning so that it is as follows:</p>
  
  <pre><code>{(
      Seleccione,
      AMAZONAS,
      ANTIOQUIA,
      ARAUCA,
      "AREA EN LITIGIO",
      ATLANTICO,
  )}
  </code></pre>