title: removing duplicate values from a column
body: <p>I am having trouble removing duplicate values from a column, I would usually do this in python but I don't have access to the environment unfortunately. </p>
  
  <p>I cant figure out how to remove duplicate values from this column.</p>
  
  <pre><code>DIR
  Output
  Output
  Input
  Output
  Input
  Input
  Input
  Input
  Output
  </code></pre>
  
  <p>I need to remove the <code>Output</code> from the column and leave that place empty, so ideally the end result would look like this</p>
  
  <pre><code>DIR
  
  
  Input
  
  Input
  Input
  Input
  Input
  </code></pre>
  
  <p>Thank you very much, I know this is a noob question, please forgive :)</p>