title: How to create Bilevel Partition using d3.js?
body: <p>I am new to <strong>d3</strong> world. I am trying to learn it from <a href="http://d3js.org/" rel="nofollow noreferrer">http://d3js.org/</a>. 
  I am trying to create a Bilevel Partition. </p>
  
  <p><img src="https://i.stack.imgur.com/aRc4N.png" alt="enter image description here"></p>
  
  <p>I couldn't get it to display any result. Here is my </p>
  
  <h2><a href="http://jsfiddle.net/bheng/rzdgepLb/" rel="nofollow noreferrer"><code>JSfiddle</code></a></h2>