title: How to sort a list by a certain order in Common Lisp?
body: <p>So i know how to sort a list like <code>(1 2 3)</code> 
  by ascended order for example in Common Lisp.</p>
  
  <p>But i need to sort this list: <code>( (1 2 3) nil 1)</code> in descending order of the <strong>3rd</strong> element. </p>
  
  <p>Is there a way to do that? </p>