title: VisJs How to import json data without creating duplicate edges?
body: <p>How can I import new json data (gephiJSON) without duplicating edges in my existing data? </p>
  
  <p>My code is as simple as that:</p>
  
  <pre><code>var parsed = vis.network.gephiParser.parseGephi(gephiJSON, parserOptions);
  nodes.update(parsed.nodes);
  edges.update(parsed.edges);
  </code></pre>
  
  <p>I am afraid I did not find any option or function to avoid/check duplicates.</p>
  
  <p>Appreciate any help.</p>
  
  <p>*I have no control over the imported data to avoid duplicates.</p>