title: Lisp list-contains program
body: <p>how can I make a Lisp program that checks if a character, string or number is in a list?</p>
  
  <p><code>(list-contains '(1 a 2 d 2 5) 'a) =&gt; T</code></p>
  
  <p><code>(list-contains '(1 a 2 d 2 5) 'x) =&gt; NIL</code></p>