title: Removing NIL's from a list LISP
body: <p>Simple question.</p>
  
  <p>Say I have a bunch of NIL's in my list q . Is there a simple way to remove the NILs and just keep the numbers?. eval doesn't seem to work here.</p>
  
  <pre><code>(NIL 1 NIL 2 NIL 3 NIL 4)
  </code></pre>
  
  <p>I need <code>(1 2 3 4)</code> </p>