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+<page xmlns="http://projectmallard.org/1.0/"
+ type="guide"
+ id="factorial">
+
+ <info>
+ <link type="guide" xref="index#equation"/>
+ </info>
+
+ <title>Factorials</title>
+
+ <p>
+ Factorials are entered using the ! symbol.
+ To calculate the factorial of 6 enter the following.
+ </p>
+ <example>
+ <p>
+ 6!
+ </p>
+ </example>
+</page>