title: sql FInding strings with duplicate characters
body: <p>I have a list of strings:</p>
  
  <ol>
  <li>HEAWAMFWSP</li>
  <li>TLHHHAFWSP</li>
  <li>AWAMFWHHAW</li>
  <li>AUAWAMHHHA</li>
  </ol>
  
  <p>Each of these strings represent 5 pairs of 2 character combinations (i.e. HE AW AM FW SP)</p>
  
  <p>What I am looking to do in SQL is to display all strings that have duplication in the pairs.</p>
  
  <p>Take string number 3 from above; AW AM FW HH AW.  I need to display this record because it has a duplicate pair (AW).  </p>
  
  <p>Is this possible?</p>
  
  <p>Thanks!</p>