title: Retrieve subpage of a define subpage
body: <p>I've a page with subpages, it looks like this (just an example, not my real data) :</p>
  
  <pre><code>-page
    ↳ apple
      ↳ iPhone
      ↳ iPad
    ↳ samsung
      ↳ Galaxy
  </code></pre>
  
  <p>I want to retrieve on the root page all the subpages of <code>apple</code>. I find a way to retrieve all subpages <code>{{Special:PrefixIndex/{{FULLPAGENAME}}/ |hideredirects=1 |stripprefix=1}}</code> but not a way to retrieve all in apple.</p>
  
  <p>The expected response should be </p>
  
  <pre><code>• Iphone
  • Ipad
  </code></pre>