title: Add a list to a list of lists in Haskell
body: <p>How can I add a list to a list of lists? Say I want to add <code>itemz</code> to <code>bagList</code>, which is a list of lists. How can I do that?</p>
  
  <pre><code>bagList itemz = mappend bagList itemz               
  </code></pre>