title: Count item frequency
body: <p>Hi I'm using Delphi and I have a StringList with this items:</p>
  
  <pre><code>45
  A15
  015
  A15
  A15
  45
  </code></pre>
  
  <p>I want to process it and make a second stringlist that will have 
  the number of appearance of each element:</p>
  
  <pre><code>45 [2]
  015 [1]
  A15 [3]
  </code></pre>
  
  <p>How can I do this with Delphi?</p>