title: How can I remove duplicate lines in Visual Studio Code?
body: <p>Say you have the following text:</p>
  
  <pre><code>abc
  123
  abc
  456
  789
  abc
  abc
  </code></pre>
  
  <p>I want to remove all "abc" lines and just keep one. I don't mind sorting. The result should be like this:</p>
  
  <pre><code>abc
  123
  456
  789
  </code></pre>