updated lec 5 hw slide

Author: BinRoot

L05_files/tree.png

@@ -600,10 +600,12 @@ <h1>Homework</h1>
 	    <h2>Trees in Haskell</h2>
 	    <ol>
 	      <li>Fill out <a target="_blank" href="https://docs.google.com/forms/d/1Jc0H2JCWLuVFN97iLXqqZHTFpznOKv8_C7WDm6FnzYg/viewform">this week's form!</a></li>
+
 	      <li>Create a binary tree data type of Int nodes</li>
 	      <pre><code class="haskell">data Tree = ... </code></pre>
 	      <li>Write a function to sum all nodes in the tree</li>
 	      <pre><code class="haskell">add :: Tree -> Int</code></pre>
+	      <center><a target="_blank" href="http://en.wikipedia.org/wiki/Binary_tree"><img src="L05_files/tree.png"></img></a></center>
 	    </ol>
 	  </section>