title: How to get all edges of two given types (i.e., labels) for a given vertex, only when both edges exist?
body: <p>For a given vertex, how can we get all the out-edges of two different types (i.e. labels) only when both edge-types exist for that vertex??</p>
  
  <p>For example,</p>
  
  <pre><code>g = TinkerGraphFactory.createTinkerGraph(); 
  </code></pre>
  
  <p>I want to know all those who have <em>created</em> some software AND <em>know</em> someone. Obviously, I can't use </p>
  
  <pre><code>g.V.out('created', 'knows')
  </code></pre>
  
  <p>because, that would give all those who have either <em>created</em> something OR <em>know</em> someone. </p>