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diff --git a/third_party/nix/doc/manual/release-notes/rl-0.13.xml b/third_party/nix/doc/manual/release-notes/rl-0.13.xml
deleted file mode 100644
index cce2e4a26b..0000000000
--- a/third_party/nix/doc/manual/release-notes/rl-0.13.xml
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@@ -1,106 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-      xmlns:xlink="http://www.w3.org/1999/xlink"
-      xmlns:xi="http://www.w3.org/2001/XInclude"
-      version="5.0"
-      xml:id="ssec-relnotes-0.13">
-
-<title>Release 0.13 (2009-11-05)</title>
-
-<para>This is primarily a bug fix release.  It has some new
-features:</para>
-
-<itemizedlist>
-
-  <listitem>
-    <para>Syntactic sugar for writing nested attribute sets.  Instead of
-
-<programlisting>
-{
-  foo = {
-    bar = 123;
-    xyzzy = true;
-  };
-  a = { b = { c = "d"; }; };
-}
-</programlisting>
-
-    you can write
-
-<programlisting>
-{
-  foo.bar = 123;
-  foo.xyzzy = true;
-  a.b.c = "d";
-}
-</programlisting>
-
-    This is useful, for instance, in NixOS configuration files.</para>
-
-  </listitem>
-
-  <listitem>
-    <para>Support for Nix channels generated by Hydra, the Nix-based
-    continuous build system.  (Hydra generates NAR archives on the
-    fly, so the size and hash of these archives isn’t known in
-    advance.)</para>
-  </listitem>
-
-  <listitem>
-    <para>Support <literal>i686-linux</literal> builds directly on
-    <literal>x86_64-linux</literal> Nix installations.  This is
-    implemented using the <function>personality()</function> syscall,
-    which causes <command>uname</command> to return
-    <literal>i686</literal> in child processes.</para>
-  </listitem>
-
-  <listitem>
-    <para>Various improvements to the <literal>chroot</literal>
-    support.  Building in a <literal>chroot</literal> works quite well
-    now.</para>
-  </listitem>
-
-  <listitem>
-    <para>Nix no longer blocks if it tries to build a path and another
-    process is already building the same path.  Instead it tries to
-    build another buildable path first.  This improves
-    parallelism.</para>
-  </listitem>
-
-  <listitem>
-    <para>Support for large (> 4 GiB) files in NAR archives.</para>
-  </listitem>
-
-  <listitem>
-    <para>Various (performance) improvements to the remote build
-    mechanism.</para>
-  </listitem>
-
-  <listitem>
-    <para>New primops: <varname>builtins.addErrorContext</varname> (to
-    add a string to stack traces — useful for debugging),
-    <varname>builtins.isBool</varname>,
-    <varname>builtins.isString</varname>,
-    <varname>builtins.isInt</varname>,
-    <varname>builtins.intersectAttrs</varname>.</para>
-  </listitem>
-
-  <listitem>
-    <para>OpenSolaris support (Sander van der Burg).</para>
-  </listitem>
-
-  <listitem>
-    <para>Stack traces are no longer displayed unless the
-    <option>--show-trace</option> option is used.</para>
-  </listitem>
-
-  <listitem>
-    <para>The scoping rules for <literal>inherit
-    (<replaceable>e</replaceable>) ...</literal> in recursive
-    attribute sets have changed.  The expression
-    <replaceable>e</replaceable> can now refer to the attributes
-    defined in the containing set.</para>
-  </listitem>
-
-</itemizedlist>
-
-</section>