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<h4 class="subsection" id="Indexing-1">3.2.8 Indexing</h4>
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<p>An index is similar to a table of contents, in that entry labels and
locations must be collected, but poses a greater challenge because it
needs to be sorted before it is output. Here, processing the document
in multiple passes is inescapable, and tools like the <code class="code">makeindex</code>
program are necessary.
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