Attn: Development Editor, Latest OCaml Weekly News

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<div id=3D"content" class=3D"content">
<h1 class=3D"title">OCaml Weekly News</h1>
<p>
<a href=3D"https://alan.petitepomme.net/cwn/2026.06.09.html">Previous Week<=
/a> <a href=3D"https://alan.petitepomme.net/cwn/index.html">Up</a> <a href=
=3D"https://alan.petitepomme.net/cwn/2026.06.23.html">Next Week</a>
</p>

<p>
Hello
</p>

<p>
Here is the latest OCaml Weekly News, for the week of June 09 to 16, 2026.
</p>

<div id=3D"table-of-contents" role=3D"doc-toc">
<h2>Table of Contents</h2>
<div id=3D"text-table-of-contents" role=3D"doc-toc">
<ul>
<li><a href=3D"#1">A line-by-line translation of the OCaml runtime from C t=
o Rust</a></li>
<li><a href=3D"#2">First release candidate for OCaml 5.5.0</a></li>
<li><a href=3D"#3">OCaml 4.14.3 for Plan 9</a></li>
<li><a href=3D"#4">Miou, a simple scheduler for OCaml 5</a></li>
<li><a href=3D"#5">OCaml 4.14.4 released</a></li>
<li><a href=3D"#org27ba163">Old CWN</a></li>
</ul>
</div>
</div>
<div id=3D"outline-container-1" class=3D"outline-2">
<h2 id=3D"1">A line-by-line translation of the OCaml runtime from C to Rust=
</h2>
<div class=3D"outline-text-2" id=3D"text-1">
<p>
Archive: <a href=3D"https://discuss.ocaml.org/t/a-line-by-line-translation-=
of-the-ocaml-runtime-from-c-to-rust/18247/1">https://discuss.ocaml.org/t/a-=
line-by-line-translation-of-the-ocaml-runtime-from-c-to-rust/18247/1</a>
</p>
</div>
<div id=3D"outline-container-org1247a78" class=3D"outline-3">
<h3 id=3D"org1247a78">Michael Bacarella announced</h3>
<div class=3D"outline-text-3" id=3D"text-org1247a78">
<p>
The Rust community owes the OCaml community a debt of gratitude, the first =
Rust compiler was written in OCaml. In this post we rewrite the OCaml runti=
me in Rust. Consider it our down payment on repaying the debt. :saluting_fa=
ce:
</p>

<p>
No Marks Shinwell were harmed[1]
</p>

<p>
<i>Editor=E2=80=99s note: the post being too long to reproduce in this news=
letter, I encourage you to read it online.</i>
</p>
</div>
</div>
</div>
<div id=3D"outline-container-2" class=3D"outline-2">
<h2 id=3D"2">First release candidate for OCaml 5.5.0</h2>
<div class=3D"outline-text-2" id=3D"text-2">
<p>
Archive: <a href=3D"https://discuss.ocaml.org/t/first-release-candidate-for=
-ocaml-5-5-0/18253/1">https://discuss.ocaml.org/t/first-release-candidate-f=
or-ocaml-5-5-0/18253/1</a>
</p>
</div>
<div id=3D"outline-container-org774cb03" class=3D"outline-3">
<h3 id=3D"org774cb03">octachron announced</h3>
<div class=3D"outline-text-3" id=3D"text-org774cb03">
<p>
The release of OCaml 5.5.0 is imminent.
</p>

<p>
As a final step, we are publishing a release candidate to check that everyt=
hing is in order before the release in the upcoming week.
</p>

<p>
If you find any bugs, please report them on the <a href=3D"https://github.c=
om/ocaml/ocaml/issues">OCaml's issue tracker</a>.
</p>

<p>
Compared to the first beta, this release candidate contains two runtime fix=
es, two standard library fixes, six miscellaneous fixes and one documentati=
on update.
</p>

<p>
The full change log for OCaml 5.5.0 is <a href=3D"https://github.com/ocaml/=
ocaml/blob/5.5/Changes">available on GitHub</a>.
</p>

<p>
Happy hacking,
Florian Angeletti for the OCaml team.
</p>
</div>
<div id=3D"outline-container-org3ed5750" class=3D"outline-4">
<h4 id=3D"org3ed5750">Installation instructions</h4>
<div class=3D"outline-text-4" id=3D"text-org3ed5750">
<p>
The base compiler can be installed as an opam switch with the following com=
mands on opam 2.1 and later:
</p>

<pre class=3D"example" id=3D"org5764f66">
opam update
opam switch create 5.5.0~rc1
</pre>

<p>
The source code for the release candidate is also directly available on:
</p>

<ul class=3D"org-ul">
<li>GitHub: <a href=3D"https://github.com/ocaml/ocaml/archive/5.5.0-rc1.tar=
.gz">https://github.com/ocaml/ocaml/archive/5.5.0-rc1.tar.gz</a></li>
<li>OCaml archives at Inria: <a href=3D"https://caml.inria.fr/pub/distrib/o=
caml-5.5/ocaml-5.5.0~rc1.tar.gz">https://caml.inria.fr/pub/distrib/ocaml-5.=
5/ocaml-5.5.0~rc1.tar.gz</a></li>
</ul>
</div>
</div>
<div id=3D"outline-container-org4bb7534" class=3D"outline-4">
<h4 id=3D"org4bb7534">Fine-tuned compiler configuration</h4>
<div class=3D"outline-text-4" id=3D"text-org4bb7534">
<p>
If you want to tweak the configuration of the compiler, you can switch to t=
he option variant with:
</p>

<pre class=3D"example" id=3D"org00565aa">
opam update
opam switch create &lt;switch_name&gt; ocaml-variants.5.5.0~rc1+options &lt=
;option_list&gt;
</pre>

<p>
where <code>&lt;option_list&gt;</code> is a space-separated list of <code>o=
caml-option-*</code> packages. For instance, for a <code>flambda</code> and=
 <code>no-flat-float-array</code> switch:
</p>

<pre class=3D"example" id=3D"org580fe55">
opam switch create 5.5.0~rc1+flambda+nffa ocaml-variants.5.5.0~rc1+options =
ocaml-option-flambda ocaml-option-no-flat-float-array
</pre>


<p>
All available options can be listed with <code>opam search ocaml-option</co=
de>.
</p>
</div>
</div>
<div id=3D"outline-container-org2024f2f" class=3D"outline-4">
<h4 id=3D"org2024f2f">Changes since the first beta release</h4>
<div class=3D"outline-text-4" id=3D"text-org2024f2f">
</div>
<ul class=3D"org-ul">
<li><a id=3D"org7a77de3"></a>Runtime fixes<br />
<div class=3D"outline-text-5" id=3D"text-org7a77de3">
<ul class=3D"org-ul">
<li><a href=3D"https://github.com/ocaml/ocaml/issues/14820">#14820</a>: cam=
l_ba_alloc must account for memory it allocated itself.
CAML_BA_SUBARRAY (introduced in 5.2) with data=3DNULL would result in the
Gc accounting for the allocation as 0 bytes, which can eventually lead
to OOM. This condition never occurs in the compiler itself, but occurs
in external C bindings that attempt to create a new bigarray in the
shape of an existing one. For backwards compatibility ignore CAML_BA_SUBARR=
AY
when data is NULL.
(Edwin T=C3=B6r=C3=B6k, review by Damien Doligez)</li>

<li>&hellip;, +<a href=3D"https://github.com/ocaml/ocaml/issues/14722">#147=
22</a>: runtime, fix in the orphaning of ephemerons
(Gabriel Scherer, review by Olivier Nicole and Damien Doligez,
 report by Jan Midtgaard)</li>
</ul>
</div>
</li>
<li><a id=3D"org8cd0c2f"></a>Standard library fix<br />
<div class=3D"outline-text-5" id=3D"text-org8cd0c2f">
<ul class=3D"org-ul">
<li><a href=3D"https://github.com/ocaml/ocaml/issues/14853">#14853</a>, CVE=
-2026-41083,
OSEC-2026-05: fix quoting of filenames passed
to <code>Filename.quote_command</code> on Windows.
(David Allsopp, report by Andrew Nesbitt, review by Florian Angeletti)</li>

<li>&hellip;, +<a href=3D"https://github.com/ocaml/ocaml/issues/14715">#147=
15</a>: Use POSIX thread-safe getgrnam_r, getgrgid_r,
getpwnam_r, getpwuid_r, gmtime_r, localtime_r, getlogin_r, and fix mktime
error checking.
(Antonin D=C3=A9cimo, review by Florian Angeletti, David Allsopp, Stefan Mu=
enzel,
 Gabriel Scherer, and Miod Vallat)</li>
</ul>
</div>
</li>
<li><a id=3D"org954eb75"></a>Compiler user-interface fix<br />
<div class=3D"outline-text-5" id=3D"text-org954eb75">
<ul class=3D"org-ul">
<li><a href=3D"https://github.com/ocaml/ocaml/issues/14702">#14702</a>: Fix=
 hidden directory files leaking into the visible load path table.
When a hidden directory contained a file whose basename was already present,
the file could be incorrectly added to the visible table.
(Hugo Heuzard, review by Florian Angeletti)</li>
</ul>
</div>
</li>
<li><a id=3D"orgc31da87"></a>Compilerlibs fix<br />
<div class=3D"outline-text-5" id=3D"text-orgc31da87">
<ul class=3D"org-ul">
<li><a href=3D"https://github.com/ocaml/ocaml/issues/14797">#14797</a>: avo=
id dropping attributes attached to package types when pretty
printing in surface syntax.
(Chet Murthy, review by Nicol=C3=A1s Ojeda B=C3=A4r)</li>
</ul>
</div>
</li>
<li><a id=3D"orgc1b03e3"></a>Configuration fixes<br />
<div class=3D"outline-text-5" id=3D"text-orgc1b03e3">
<ul class=3D"org-ul">
<li><a href=3D"https://github.com/ocaml/ocaml/issues/14484">#14484</a>: Set=
 <code>_WIN32_WINNT</code> to require Windows 8/Server 2012 Windows header =
SDK
support.
(Antonin D=C3=A9cimo, review by David Allsopp)</li>

<li><a href=3D"https://github.com/ocaml/ocaml/issues/14760">#14760</a>, <a =
href=3D"https://github.com/ocaml/ocaml/issues/14802">#14802</a>, <a href=3D=
"https://github.com/ocaml/ocaml/issues/14846">#14846</a>: Correct the detec=
tion of argument defaults in
configure, fixing an incorrect error message when installing OCaml through
opam on OpenSUSE with the site-config package installed.
(David Allsopp, report and review by Edwin T=C3=B6r=C3=B6k)</li>
</ul>
</div>
</li>
<li><a id=3D"orgd17b354"></a>Documentation fix<br />
<div class=3D"outline-text-5" id=3D"text-orgd17b354">
<ul class=3D"org-ul">
<li><a href=3D"https://github.com/ocaml/ocaml/issues/14684">#14684</a>, <a =
href=3D"https://github.com/ocaml/ocaml/issues/14782">#14782</a>, <a href=3D=
"https://github.com/ocaml/ocaml/issues/14838">#14838</a>: Improve ocamlc's =
and ocamlopt's manual pages and fix
small issues in the manual
(Samuel Hym, review by Florian Angeletti, Antonin D=C3=A9cimo, Gabriel Sche=
rer and
Nicol=C3=A1s Ojeda B=C3=A4r)</li>
</ul>
</div>
</li>
<li><a id=3D"org828a459"></a>Internal fix<br />
<div class=3D"outline-text-5" id=3D"text-org828a459">
<ul class=3D"org-ul">
<li>&hellip;, +<a href=3D"https://github.com/ocaml/ocaml/issues/14550">#145=
50</a>: Add the not-root builtin ocamltest action. This
allows to skip tests that fail if the current user is root (superuser).
(Kate Deplaix, review by Gabriel Scherer, Nicol=C3=A1s Ojeda B=C3=A4r, and
 Antonin D=C3=A9cimo)</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
</div>
<div id=3D"outline-container-3" class=3D"outline-2">
<h2 id=3D"3">OCaml 4.14.3 for Plan 9</h2>
<div class=3D"outline-text-2" id=3D"text-3">
<p>
Archive: <a href=3D"https://discuss.ocaml.org/t/ocaml-4-14-3-for-plan-9/182=
23/2">https://discuss.ocaml.org/t/ocaml-4-14-3-for-plan-9/18223/2</a>
</p>
</div>
<div id=3D"outline-container-org31cbceb" class=3D"outline-3">
<h3 id=3D"org31cbceb">Continuing this thread, Eduardo Cavazos announced</h3>
<div class=3D"outline-text-3" id=3D"text-org31cbceb">
<p>
Here's a demo of the ocaml repl in the acme editor in plan9 and some integr=
ation features:
</p>

<p>
<a href=3D"https://youtu.be/0GP_V1sACTw">https://youtu.be/0GP_V1sACTw</a>
</p>

<p>
The acme-repl demonstrated there is here:
</p>

<p>
<a href=3D"https://github.com/dharmatech/acme-repl">https://github.com/dhar=
matech/acme-repl</a>
</p>
</div>
</div>
</div>
<div id=3D"outline-container-4" class=3D"outline-2">
<h2 id=3D"4">Miou, a simple scheduler for OCaml 5</h2>
<div class=3D"outline-text-2" id=3D"text-4">
<p>
Archive: <a href=3D"https://discuss.ocaml.org/t/ann-miou-a-simple-scheduler=
-for-ocaml-5/12963/19">https://discuss.ocaml.org/t/ann-miou-a-simple-schedu=
ler-for-ocaml-5/12963/19</a>
</p>
</div>
<div id=3D"outline-container-orgbaadee6" class=3D"outline-3">
<h3 id=3D"orgbaadee6">Calascibetta Romain announced</h3>
<div class=3D"outline-text-3" id=3D"text-orgbaadee6">
<p>
I am delighted to announce the release of <a href=3D"https://github.com/rob=
ur-coop/miou/releases/tag/v0.7.0">miou.0.7.0</a>. Whilst this release isn=
=E2=80=99t quite as impressive as previous ones, it now provides us with a =
pure OCaml implementation of SSH for our unikernels! This release notably i=
ntroduces <code>Miou.get</code>, which allows you to wait for and retrieve =
a task saved in an orphan: for this, we refer you to our documentation avai=
lable <a href=3D"https://docs.osau.re/local/miou/Miou/index.html#orphans">h=
ere</a>.
</p>

<p>
This release also strengthens our ecosystem in general: following <code>htt=
p</code>, <code>tls</code>, <code>tcp/ip</code>, <code>smtp</code>, <code>d=
ns</code> and <code>ntp</code>, we can now add <code>ssh</code> to the prot=
ocols available for our unikernels (as well as for OCaml applications in ge=
neral). It is largely thanks to @hannes=E2=80=99s <a href=3D"https://github=
.com/mirage/awa-ssh/pull/85">work</a> on migrating from <code>Cstruct.t</co=
de> (which we are now deprecating) to <code>string</code> (a process we beg=
an several years ago following observations of <a href=3D"https://blog.robu=
r.coop/articles/speeding-ec-string.html">performance issues with Cstruct.t<=
/a>) that we have managed to complete <code>mnet-ssh</code>.
</p>

<p>
And so, thanks to our work on <code>notty~/~nottui</code> (and [~lwd~](gith=
ub.com/let-def/lwd)), SSH support for unikernels, and one of our MirageOS r=
etreats, we have revived a project developed by @reynir: <a href=3D"https:/=
/github.com/reynir/banawa-chat/">banawa-chat</a>. It is a unikernel that of=
fers "a chat room for everyone" via SSH; you simply need to connect to it t=
o chat with others (a mini IRC) and it provides a TUI even though the unike=
rnel does not recognise the concept of a terminal! The project is available=
 <a href=3D"https://github.com/reynir/banawa-chat/pull/3">here</a> (and an =
<code>opam pin</code> is all you need to obtain <code>banawa.hvt</code>).
</p>


<div id=3D"org4e1c8f0" class=3D"figure">
<p><img src=3D"https://us1.discourse-cdn.com/flex020/uploads/ocaml/original=
/2X/e/e857f94d3f9f25767e79d2efccd893f2c4e2e044.webp" alt=3D"e857f94d3f9f257=
67e79d2efccd893f2c4e2e044.webp" width=3D"80%" />
</p>
</div>

<p>
This consolidation is now taking shape with the emergence of a few unikerne=
ls and tools, and we=E2=80=99re taking this opportunity to introduce you to=
 a few that are now available:
</p>
<ul class=3D"org-ul">
<li>another older unikernel has just reappeared: <a href=3D"https://github.=
com/dinosaure/pasteur">pasteur</a> and its deployment <a href=3D"https://pa=
ste.osau.re/">https://paste.osau.re/</a>. It brings our efforts to <a href=
=3D"https://github.com/robur-coop/vif"><code>vif</code></a> and demonstrate=
s how to create a simple web application in the form of a unikernel.</li>
<li><a href=3D"https://github.com/robur-coop/aussi"><code>aussi</code></a> =
is a small experimental project that can be used with Docker to deploy Solo=
5 unikernels quite simply (a simple <code>docker run</code> is enough now!)=
. However, we still recommend using <a href=3D"https://github.com/robur-coo=
p/albatross">albatross</a> for production deployment.</li>
<li><a href=3D"https://github.com/robur-coop/chaos"><code>chaos</code></a> =
has finally crossed the Rubicon. Having started this project a year ago to =
experiment with our new workflow, this NTP server ("<a href=3D"https://chro=
ny-project.org/">Chrony</a>-style") is now available at <code>osau.re:123</=
code></li>
</ul>

<p>
We therefore continue to offer unikernels and actively use them in order to=
 improve them. As such, we would like to thank everyone who provides us wit=
h (any kind of) feedback on what we are developing, enabling us to collecti=
vely improve what our cooperative can offer the OCaml community (and, more =
broadly, the users of our unikernels). If you like what we do, you can supp=
ort us via a donation (<a href=3D"https://robur.coop/Donate">directly</a> o=
r via <a href=3D"https://github.com/sponsors/robur-coop">GitHub</a>). Happy=
 hacking!
</p>
</div>
</div>
</div>
<div id=3D"outline-container-5" class=3D"outline-2">
<h2 id=3D"5">OCaml 4.14.4 released</h2>
<div class=3D"outline-text-2" id=3D"text-5">
<p>
Archive: <a href=3D"https://discuss.ocaml.org/t/ocaml-4-14-4-released/18258=
/1">https://discuss.ocaml.org/t/ocaml-4-14-4-released/18258/1</a>
</p>
</div>
<div id=3D"outline-container-orgdd087f8" class=3D"outline-3">
<h3 id=3D"orgdd087f8">octachron announced</h3>
<div class=3D"outline-text-3" id=3D"text-orgdd087f8">
<p>
We have the pleasure of celebrating the anniversary of the first flight of =
Ariane 4 by announcing the release of OCaml version 4.14.4[^1].
</p>

<p>
This release is a collection of safe bug fixes and security fixes for the s=
tandard library, cherry-picked from the OCaml 5 branch.
</p>

<p>
The 4.14 branch is expected to receive episodic updates until at least the =
end of 2026.
</p>

<p>
However, the end of its extended maintenance period is on the horizon.
Consequently, please mention to us any obstacle remaining to your migration=
 to OCaml 5.
</p>

<p>
In the meanwhile, do not hesitate to report any bugs on the <a href=3D"http=
s://github.com/ocaml/ocaml/issues">OCaml issue tracker</a>.
</p>

<p>
See the list of changes below for more details.
</p>

<p>
Happy hacking,
Florian Angeletti for the OCaml team.
</p>

<p>
&mdash;
</p>
</div>
<div id=3D"outline-container-orge23a753" class=3D"outline-4">
<h4 id=3D"orge23a753">Installation Instructions</h4>
<div class=3D"outline-text-4" id=3D"text-orge23a753">
<p>
The base compiler can be installed as an opam switch with the following com=
mands:
</p>
<pre class=3D"example" id=3D"org3f3099a">
opam update
opam switch create 4.14.4
</pre>
<p>
The source code for the release candidate is also directly available on:
</p>
<ul class=3D"org-ul">
<li><a href=3D"https://github.com/ocaml/ocaml/archive/4.14.4.tar.gz">GitHub=
</a></li>
<li><a href=3D"https://caml.inria.fr/pub/distrib/ocaml-4.14/ocaml-4.14.4.ta=
r.gz">Inria archive</a></li>
</ul>

<p>
&mdash;
</p>
</div>
</div>
<div id=3D"outline-container-orgdbad92c" class=3D"outline-4">
<h4 id=3D"orgdbad92c">Changes in OCaml 4.14.4 (15 June 2026)</h4>
<div class=3D"outline-text-4" id=3D"text-orgdbad92c">
</div>
<ul class=3D"org-ul">
<li><a id=3D"org44c9a67"></a>Build system:<br />
<div class=3D"outline-text-5" id=3D"text-org44c9a67">
<ul class=3D"org-ul">
<li><a href=3D"https://github.com/ocaml/ocaml/issues/12372">#12372</a>, <a =
href=3D"https://github.com/ocaml/ocaml/issues/14572">#14572</a>: Pass optio=
n -no-execute-only to the linker for OpenBSD &gt;=3D 7.3
so that code sections remain readable, as needed for closure marshaling.
Originally backported in 4.14.2, but the flag was accidentally not passed w=
hen
linking the .so versions of the OCaml runtime libraries or when linking .cm=
xs
files.
(Xavier Leroy and Anil Madhavapeddy, review by Anil Madhavapeddy and
S=C3=A9bastien Hinderer)</li>
</ul>
</div>
</li>
<li><a id=3D"org8493e15"></a>Bug fixes:<br />
<div class=3D"outline-text-5" id=3D"text-org8493e15">
<ul class=3D"org-ul">
<li><a href=3D"https://github.com/ocaml/ocaml/issues/14599">#14599</a>, <a =
href=3D"https://github.com/ocaml/ocaml/issues/14606">#14606</a>: on ARM64 p=
latforms, ocamlopt was under-estimating
the sizes of some instructions.  This could lead to overflows in
relative branch offsets, reported as errors by the assembler.
(Xavier Leroy, review by Vincent Laviron, report by Rapha=C3=ABl Proust)</l=
i>

<li><a href=3D"https://github.com/ocaml/ocaml/issues/14607">#14607</a>: Fix=
 linking with libasmrun_shared.so on Risc-V (undefined symbol
declared riscv.o)
(David Allsopp, review by Nicol=C3=A1s Ojeda B=C3=A4r)</li>

<li><a href=3D"https://github.com/ocaml/ocaml/issues/14661">#14661</a>: Bui=
ld dllthreads.so with pthreads flags (removed in <a href=3D"https://github.=
com/ocaml/ocaml/issues/13018">#13018</a>). For
normal programs there's no semantic difference, because ocamlrun and
ocamlc.opt are always linked with pthreads, but it was a regression to requ=
ire
programs wishing to dlopen dllthreads.so to have already linked with pthrea=
ds
themselves.
(David Allsopp, review by Gabriel Scherer)</li>

<li><a href=3D"https://github.com/ocaml/ocaml/issues/14655">#14655</a>, <a =
href=3D"https://github.com/ocaml/ocaml/issues/14691">#14691</a>, CVE-2026-3=
4353, OSEC-2026-04: check for size overflow in
caml_ba_reshape
(Stephen Dolan, review by Xavier Leroy)</li>

<li><a href=3D"https://github.com/ocaml/ocaml/issues/14853">#14853</a>, CVE=
-2026-41083, OSEC-2026-05: fix quoting of filenames passed to
Filename.quote_command on Windows.
(David Allsopp, report by Andrew Nesbitt, review by Florian Angeletti)</li>
</ul>

<p>
[^1]: The release of OCaml 5.5.0 is planned later this week.
</p>
</div>
</li>
</ul>
</div>
</div>
</div>
<div id=3D"outline-container-org27ba163" class=3D"outline-2">
<h2 id=3D"org27ba163">Old CWN</h2>
<div class=3D"outline-text-2" id=3D"text-org27ba163">
<p>
If you happen to miss a CWN, you can <a href=3D"mailto:alan.schmitt@polytec=
hnique.org">send me a message</a> and I'll mail it to you, or go take a loo=
k at <a href=3D"https://alan.petitepomme.net/cwn/">the archive</a> or the <=
a href=3D"https://alan.petitepomme.net/cwn/cwn.rss">RSS feed of the archive=
s</a>.
</p>

<p>
If you also wish to receive it every week by mail, you may subscribe to the=
 <a href=3D"https://sympa.inria.fr/sympa/info/caml-list">caml-list</a>.
</p>

<div class=3D"authorname" id=3D"org8f22643">
<p>
<a href=3D"https://alan.petitepomme.net/">Alan Schmitt</a>
</p>

</div>
</div>
</div>
</div>
</body>
</html>


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