title: Uniqueness in a list of lists with lists
body: <p>I have a list of lists and some of the lists have a list in it:    </p>
  
  <pre><code>x = [[[1,2],3],[[3,4],5], [[1,2],3]]
  </code></pre>
  
  <p>I have tried getting uniqueness to obtain:</p>
  
  <pre><code>x = [[[1,2],3],[[3,4],5]]
  </code></pre>
  
  <p>But no luck - any ideas?</p>
  
  <p>I have so far used:</p>
  
  <pre><code>unique_data = [list(el) for el in set(tuple(el) for el in x)]
  </code></pre>
  
  <p>on a list of lists which works, but when adding in an element of a list within the list it fails</p>