title: How to Determine a Common Element in a Set of Tuples - Python
body: <p>Say I have a set of tuples, with each tuple containing two integers.</p>
  
  <pre><code>mySet = ((1, 3), (3, 4), (3, 5))
  </code></pre>
  
  <p>What would be the best way to find a <strong>common element</strong> from tuples? </p>
  
  <p>For this case <strong>output</strong> will be :</p>
  
  <pre><code>3
  </code></pre>