title: Unique Value for Two Strings
body: <p>This seems like a fairly simple problem, but the solution is eluding me:</p>
  
  <p>If I have the following two strings:</p>
  
  <pre><code>string str1 = "Ping";
  string str2 = "Pong";
  </code></pre>
  
  <p>I'm needing an algorithm to create a unique value for the two strings, no matter what order they are in. For example:</p>
  
  <p>UniqueValue(str1, str2) and UniqueValue(str2, str1) should return the exact same value.</p>
  
  <p>EDIT: UniqueValue returns a string. I understand it won't be "truly" unique, but a hash-like value will work.</p>
  
  <p></p>
  
  <p>Thanks,
  Tyler</p>