title: Merging two or more "lists" in columns?
body: <p>Trying to find a way to merge multiple lists while preserving the order the items are in, right-to-left, <strong>then</strong> top-to-bottom.</p>
  
  <p>Example:</p>
  
  <pre><code>A B C
  D E
  F
  G H
  </code></pre>
  
  <p>should become:</p>
  
  <pre><code>A
  B
  C
  D
  E
  F
  G
  H
  </code></pre>
  
  <p>and not</p>
  
  <pre><code>A
  D
  F
  G
  B
  E
  H
  C
  </code></pre>
  
  <p>I have found countless sites with people explaining how I can just stick one list to the end of the previous (as shown in the "and not" example), but that is precisely <strong>not</strong> what I'm searching for.</p>
  
  <p>Potential duplicate entries don't matter.</p>
  
  <p><a href="https://docs.google.com/spreadsheets/d/19Pyy6jzK8eOBWcEDjX7Df60LH1BYswzbJKMvVF5WlAg/edit?usp=sharing" rel="nofollow noreferrer">Editable example sheet here.</a></p>