title: List of Lists by Pairs
body: <p>I have two lists and I would like to create a list of lists but mainting the order, so if I have:</p>
  
  <pre><code>l1 = [1,2,3,2]
  l2 = [2,3,4,1]
  </code></pre>
  
  <p>I would like to have:</p>
  
  <pre><code>ans = [[1,2],[2,3],[3,4],[2,1]]
  </code></pre>
  
  <p>It mantains the order of the indexes</p>
  
  <p>Thank you!</p>