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Program 2
 

<manual-page name="fac">
   <form>(fac n)</form>
   <description>
      <span>The <em>factorial function</em>. Also known as n!</span>
   </description>
   <precondition>n &gt;= 0</precondition>
   <parameters><parameter name=\"n\">An integer</parameter></parameters>
   <returns>n * (n-1) * ... * 1</returns>
</manual-page>