title: Gremlin intersection of common vertices
body: <p>I have a query that looks like the following:</p>
  
  <p><code>"g.V('0_mr').out().out()"</code></p>
  
  <pre><code>v[11_i]
  v[13_i]
  v[22_i]
  v[23_i]
  v[25_i]
  v[28_i]
  v[11_i]
  v[13_i]
  v[19_i]
  v[29_i]
  </code></pre>
  
  <p>Vertices <code>11_i</code> and <code>13_i</code> are common vertices for this traversal. How can filter to simply return the common intersecting vertices?</p>