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<title>Preprocessor Support (The GNU Troff Manual)</title>
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<h4 class="subsection" id="Preprocessor-Support-1">3.2.13 Preprocessor Support</h4>
<p>All macro packages provide support for various preprocessors and may
extend their functionality by defining macros to set their contents in
displays. Examples include <code class="code">TS</code> and <code class="code">TE</code> for <code class="command">gtbl</code>,
<code class="code">EQ</code> and <code class="code">EN</code> for <code class="command">geqn</code>, and <code class="code">PS</code> and <code class="code">PE</code>
for <code class="command">gpic</code>.
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