title: Connect edges with graph dot
body: <p>I need to add a link between two edges using dot. 
  What I need to add to the graph is the red link labeled "b" between the two edges showed in picture. </p>
  
  <p>The source code is the following:</p>
  
  <pre><code>digraph { 
      a -&gt; b; 
      a -&gt; c; 
  } 
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/JuTw9.png" alt="enter image description here"></p>