title: external sorting
body: <p>In this web page: <a href="https://web.archive.org/web/20110504141851/http://web.eecs.utk.edu/%7Ehuangj/CS302S04/notes/external-sorting2.html" rel="nofollow noreferrer">CS302 --- External Sorting</a></p>
  <blockquote>
  <p>Merge the resulting runs together into successively bigger runs, until the file is sorted.</p>
  </blockquote>
  <p>As I quoted, how can we merge the resulting runs together??? We don't have that much memory.</p>