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  23 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
  24 <a name="reordering-in-levels-0-and-1"></a>Reordering in levels 0 and 1</h2></div></div></div>
  25 <p>
  26     Another common operation in the more complex shapers is when things
  27     reorder. In those cases, to maintain monotone clusters, HB merges
  28     the clusters of everything in the reordering sequence. For example,
  29     let's again start with the character sequence:
  30   </p>
  31 <pre class="programlisting">
  32    A,B,C,D,E
  33    0,1,2,3,4
  34 </pre>
  35 <p>
  36     If <code class="literal">D</code> is reordered before <code class="literal">B</code>,
  37     then the <code class="literal">B</code>, <code class="literal">C</code>, and
  38     <code class="literal">D</code> clusters merge, and we get:
  39   </p>
  40 <pre class="programlisting">
  41    A,D,B,C,E
  42    0,1,1,1,4
  43 </pre>
  44 <p>
  45     This is clearly not ideal, but it is the only sensible way to
  46     maintain monotone indices and retain the true relationship between
  47     glyphs and characters.
  48   </p>
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