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+<head>
+<title>UK TeX FAQ -- question label inputlev</title>
+</head><body>
+<h3>Capacity exceeded - input levels</h3>
+<p>The error
+<pre>
+! TeX capacity exceeded, sorry [text input levels=15].
+</pre>
+
+is caused by nesting your input too deeply. You can provoke it with
+the trivial (Plain TeX) file <i>input.tex</i>, which contains
+nothing but:
+<pre>
+\input input
+</pre>
+In the real world, you are unlikely to encounter the error with a
+modern TeX distribution. TeTeX (used to produce the error
+message above) allows 15 files open for TeX input at any one time,
+which is improbably huge for a document generated by real human
+beings.
+<p>However, for those improbable (or machine-generated) situations,
+some distributions offer the opportunity to adjust the parameter
+<code>max_in_open</code> in a configuration file.
+<p><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=inputlev">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=inputlev</a>
+</body>