title: How to use compare several dataframes and return the matches using pandas
body: <p>If I have a several pandas dataframes that look like this:</p>
  
  <pre><code>Name       Score
  Sam        4
  Aaron      5
  Neil       6
  Ben        7
  
  Name       Score
  Morgan     5
  Neil       6
  Adam       8
  Ben        5
  
  Name       Score
  Evan       5
  Nathan     4
  Neil       6
  Ben        2
  </code></pre>
  
  <p>How can I use pandas.concat(join) to join all the dataframes in one large one and then only return the names that are found in all three dataframes?</p>
  
  <p>Expected Output:</p>
  
  <pre><code>Name
  Neil
  Ben
  </code></pre>