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use strict;
use warnings;
...
</exercises>
</chbody>
</chapter>

<chapter>
  <chbody>
...
        <item>
          <inst>\t{{Num}\.\t</inst>
          <para>Text4</para></item></orderedlist></exercises></chbody>
+</chapter>

<chapter>
<chbody>
...
</exercises>           
</chbody>
</chapter>