title: Un-nesting nested lists
body: <p>Hi I was wondering how I could un-nest a nested nested list. I have:</p>
  
  <pre><code>list = [[[1,2,3]], [[4,5,6]], [[7,8,9]]]
  </code></pre>
  
  <p>I would like to to look as follows:</p>
  
  <pre><code>new_list = [[1,2,3], [4,5,6], [7,8,9]]
  </code></pre>
  
  <p>How to do it?</p>