title: Prolog programming - simple negative query
body: <p>My database is:</p>
  
  <pre><code>eat(magi,limo).
  eat(nona,banana).
  </code></pre>
  
  <p>How do I ask: "Who's not eating limo?" This:</p>
  
  <pre><code>eat(X,not(limo)).
  </code></pre>
  
  <p>Doesn't work. :(</p>