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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>