Remove all child nodes except last using XSLT

I have an XML file as such:

<a>
  <b>
    <e/ >
    <f/ >
  </b>
  <c>
    <g>
      <j/ >
    </g>
    <g>
      <j/ >
    </g>
    <g>
      <j/ >
    </g>
  </c>
  <d>
    <h>
      <i/ >
    </h>
    <h>
      <i/ >
    </h>
    <h>
      <i/ >
    </h>
  </d>
</a>

What I'm trying to do is to apply an XSLT transformation to get only get the last nodes of c and d (including their child nodes), resulting in:

<a>
  <b>
    <e/ >
    <f/ >
  </b>
  <c>
    <g>
      <j/ >
    </g>
  </c>
  <d>
    <h>
      <i/ >
    </h>
  </d>
</a>

I am not experienced with XSLT and any help is greatly appreciated.