title: Names of R's available packages
body: <p>I'm eager to know,</p>
  
  <ul>
  <li>how many package names on CRAN have two, three, N characters?</li>
  <li>which combinations have not yet been used ("unpoppler")</li>
  <li>how many package names use full-caps, or camelCase?</li>
  <li>how many package names end in 2?</li>
  </ul>
  
  <p>I think it might reveal some interesting facts.</p>
  
  <p><em>Edit:</em> bonus points for animated graphics showing the time-evolution of CRAN packages.</p>