title: Create a list with all possible permutations from a know list of objects, but make the final list x in size
body: <p>Lets say I have the following list: </p>
  
  <pre><code>lst = [0,1,3,a,b,c]
  </code></pre>
  
  <p>I would like the final outcome to be all possible permutations of <code>lst</code>, but be 20 characters long.</p>
  
  <p>I have looked and can only find examples that would create a final outcome that would be 6 or less in length.</p>
  
  <p>Any ideas?</p>