code: def view_links(obj):
      ''' Link to performance data and duplicate overview.'''
      result=format_html('')
      result+=format_html('<a href="%s" style="white-space: nowrap">Show duplicates</a><br/>'%reverse('duplicates', args=(obj.pk,)))
      result+=format_html('<a href="%s" style="white-space: nowrap">Show submissions</a><br/>'%obj.grading_url())
      result+=format_html('<a href="%s" style="white-space: nowrap">Download submissions</a>'%reverse('assarchive', args=(obj.pk,)))
      return resulf view_links(obj):
      ''' Link to performance data and duplicate overview.'''
      result=format_html('')
      result+=format_html('<a href="%s" style="white-space: nowrap">Show duplicates</a><br/>'%reverse('duplicates', args=(obj.pk,)))
      result+=format_html('<a href="%s" style="white-space: nowrap">Show submissions</a><br/>'%obj.grading_url())
      result+=format_html('<a href="%s" style="white-space: nowrap">Download submissions</a>'%reverse('assarchive', args=(obj.pk,)))
      return result
docs: Link to performance data and duplicate overview.