title: How can i create a list of lists
body: <p>I have a list of offset vars and i need to put it in another list so
  I can call it like</p>
  
  <pre><code>List&lt;list&lt;offset&gt;&gt; coords 
    coords[0][i] = points[i] 
  </code></pre>
  
  <p>But it didnt work.</p>
  
  <p>Any suggestion?? </p>