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diff --git a/sphinx/themes/basic/genindex-single.html b/sphinx/themes/basic/genindex-single.html
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+{#
+    basic/genindex-single.html
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    Template for a "single" page of a split index.
+
+    :copyright: Copyright 2007-2023 by the Sphinx team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+#}
+{% macro indexentries(firstname, links) %}
+  {%- if links -%}
+    <a href="{{ links[0][1] }}">
+    {%- if links[0][0] %}<strong>{% endif -%}
+    {{ firstname|e }}
+    {%- if links[0][0] %}</strong>{% endif -%}
+    </a>
+
+    {%- for ismain, link in links[1:] -%}
+      , <a href="{{ link }}">{% if ismain %}<strong>{% endif -%}
+      [{{ loop.index }}]
+      {%- if ismain %}</strong>{% endif -%}
+      </a>
+    {%- endfor %}
+  {%- else %}
+    {{ firstname|e }}
+  {%- endif %}
+{% endmacro %}
+
+{%- extends "layout.html" %}
+{% set title = _('Index') %}
+{% block body %}
+
+<h1 id="index">{% trans key=key %}Index &ndash; {{ key }}{% endtrans %}</h1>
+
+<table style="width: 100%" class="indextable"><tr>
+  {%- for column in entries|slice(2) if column %}
+  <td style="width: 33%; vertical-align: top;"><ul>
+    {%- for entryname, (links, subitems, _) in column %}
+      <li>{{ indexentries(entryname, links) }}
+      {%- if subitems %}
+      <ul>
+      {%- for subentryname, subentrylinks in subitems %}
+        <li>{{ indexentries(subentryname, subentrylinks) }}</li>
+      {%- endfor %}
+      </ul>
+      {%- endif -%}</li>
+    {%- endfor %}
+  </ul></td>
+  {%- endfor %}
+</tr></table>
+
+{% endblock %}
+
+{% block sidebarrel %}
+   <h4>{{ _('Index') }}</h4>
+   <p>{% for key, dummy in genindexentries -%}
+   <a href="{{ pathto('genindex-' + key) }}"><strong>{{ key }}</strong></a>
+     {% if not loop.last %}| {% endif %}
+   {%- endfor %}</p>
+
+   <p><a href="{{ pathto('genindex-all') }}"><strong>{{ _('Full index on one page') }}</strong></a></p>
+   {{ super() }}
+{% endblock %}