title: How to randomize a multidimensional NSMutableArray?
body: <p>So, I was tasked with randomizing a multidimensional array in Objective-C.</p>
  
  <p>I needed to make this:</p>
  
  <pre><code>[[1,2,3],[4,5,6],[7,8,9],[10,11,12]]
  </code></pre>
  
  <p>Look something like this:</p>
  
  <pre><code>[[4,8,6],[1,7,9],[2,11,10],[3,5,12]]
  </code></pre>
  
  <p>I did that by hand, so please excuse me for the poor randomization.</p>