title: Pythonic way of removing reversed duplicates in list
body: <p>I have a list of pairs:</p>
  
  <pre><code>[0, 1], [0, 4], [1, 0], [1, 4], [4, 0], [4, 1]
  </code></pre>
  
  <p>and I want to remove any duplicates where</p>
  
  <pre><code>[a,b] == [b,a]
  </code></pre>
  
  <p>So we end up with just</p>
  
  <pre><code>[0, 1], [0, 4], [1, 4]
  </code></pre>
  
  <p>I can do an inner &amp; outer loop checking for the reverse pair and append to a list if that's not the case, but I'm sure there's a more Pythonic way of achieving the same results.</p>