title: Complexity of searching this article database
body: <p>Let's say I have a database:</p>
  
  <ul>
  <li><code>k</code> articles</li>
  <li>each article has a title with <code>l</code> words in it</li>
  <li>my search query has <code>m</code> tokens</li>
  </ul>
  
  <p>To search for each of my tokens in the titles of all articles is <code>m * k * l</code></p>
  
  <p>Am I right in thinking that this is <code>O(n)</code> ?</p>