Debian Bug report logs - #662660
cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Fabian Greffrath <fabian@greffrath.com>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Mon, 05 Mar 2012 16:00:38 +0100

[Message part 1 (text/plain, inline)]

Package: cups-filters
Version: 1.0.2-1
Severity: wishlist
Tags: patch

Hi,

I am sorry I feel the need to re-iterate #495598, but cups's and now cups-
filters's hard dependency on ttf-freefonts package is still disturbing me.
However, this time I provide a patch.

I don't think that the cups-filters - especially the texttopdf filter - should
rely on symlinks to actual TTF fontfiles named after the file names listed in
the pdf.utf-8.* maps. Instead, if the symlink in question does not exist or
does not lead to a valid TTF font file, the filter should ask fontconfig what
the next best matching font is. That is what fontconfig is
actually for. This way, the hard dependency on ttf-freefonts could get demoted
to a Recommends or at least get some alternative dependencies added. \o/

TL;DR: Please review the attached patch!

Cheers,
Fabian



-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (901, 'testing'), (501, 'unstable'), (101, 'experimental')
Architecture: i386 (i686)

Kernel: Linux 3.1.0-1-686-pae (SMP w/1 CPU core)
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages cups-filters depends on:
ii  ghostscript      9.05~dfsg-2
ii  libc6            2.13-26
ii  libcups2         1.5.2-5
ii  libcupsfilters1  1.0.2-1
ii  libcupsimage2    1.5.2-5
ii  libgcc1          1:4.6.2-12
ii  libijs-0.35      0.35-8
ii  liblcms2-2       2.2+git20110628-2
ii  libpoppler13     0.16.7-3
ii  libstdc++6       4.6.2-12
ii  ttf-freefont     20100919-1
ii  zlib1g           1:1.2.6.dfsg-1

Versions of packages cups-filters recommends:
pn  colord            0.1.16-2
pn  foomatic-filters  <none>
pn  ghostscript-cups  <none>

Versions of packages cups-filters suggests:
pn  foomatic-db-compressed-ppds | foomatic-db  <none>

[texttopdf_fontconfig.patch (text/x-diff, attachment)]

Message #10 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Martin Pitt <mpitt@debian.org>

To: Fabian Greffrath <fabian@greffrath.com>, 662660@bugs.debian.org

Cc: Till Kamppeter <till.kamppeter@gmail.com>

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Tue, 6 Mar 2012 13:55:13 +0100

Hello Fabian,

Fabian Greffrath [2012-03-05 16:00 +0100]:
> I don't think that the cups-filters - especially the texttopdf filter - should
> rely on symlinks to actual TTF fontfiles named after the file names listed in
> the pdf.utf-8.* maps. Instead, if the symlink in question does not exist or
> does not lead to a valid TTF font file, the filter should ask fontconfig what
> the next best matching font is. That is what fontconfig is
> actually for. This way, the hard dependency on ttf-freefonts could get demoted
> to a Recommends or at least get some alternative dependencies added. \o/

Thanks for the patch! Till (CC'ed) tried it, and said that while the
job completes without error when freefont is not installed, the
output is unreadable. So perhaps the fontconfig selection is not tight
enough on similar fonts?

I'm just parroting here, Till knows the details.

Thanks,

Martin

-- 
Martin Pitt                        | http://www.piware.de
Ubuntu Developer (www.ubuntu.com)  | Debian Developer  (www.debian.org)

Message #15 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Fabian Greffrath <fabian@greffrath.com>

To: Martin Pitt <mpitt@debian.org>

Cc: 662660@bugs.debian.org, Till Kamppeter <till.kamppeter@gmail.com>

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Tue, 06 Mar 2012 14:07:47 +0100

Hey Martin and Till,

Am 06.03.2012 13:55, schrieb Martin Pitt:
> Thanks for the patch! Till (CC'ed) tried it, and said that while the
> job completes without error when freefont is not installed, the
> output is unreadable. So perhaps the fontconfig selection is not tight
> enough on similar fonts?

cool, thank you so much for trying it out!

Unfortunately, I have not yet found out how to tell fontconfig to 
return *only* TrueType fonts. If you have e.g. gsfonts installed, then 
fontconfig might return the Type1 Nimbus Mono font when asked for the 
best replacement for FreeMono. But I am glad it's at least not 
crashing. ;)

 - Fabian

Message #20 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Fabian Greffrath <fabian@greffrath.com>

To: Martin Pitt <mpitt@debian.org>

Cc: 662660@bugs.debian.org, Till Kamppeter <till.kamppeter@gmail.com>

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Tue, 06 Mar 2012 14:50:11 +0100

Am 06.03.2012 13:55, schrieb Martin Pitt:
> Thanks for the patch! Till (CC'ed) tried it, and said that while the
> job completes without error when freefont is not installed, the
> output is unreadable. So perhaps the fontconfig selection is not tight
> enough on similar fonts?

What does "fc-match FreeMono.ttf" give?

Message #25 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Till Kamppeter <till.kamppeter@gmail.com>

To: Fabian Greffrath <fabian@greffrath.com>

Cc: Martin Pitt <mpitt@debian.org>, 662660@bugs.debian.org

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Tue, 06 Mar 2012 15:42:46 +0100

till@till-precise:~/ubuntu/cups/bzr/build-area/cups-1.5.2$ fc-match 
FreeMono.ttfDejaVuSans.ttf: "DejaVu Sans" "Book"
till@till-precise:~/ubuntu/cups/bzr/build-area/cups-1.5.2$

   Till

Message #30 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Fabian Greffrath <fabian@greffrath.com>

To: Till Kamppeter <till.kamppeter@gmail.com>

Cc: Martin Pitt <mpitt@debian.org>, 662660@bugs.debian.org

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Tue, 06 Mar 2012 15:57:14 +0100

Am 06.03.2012 15:42, schrieb Till Kamppeter:
> till@till-precise:~/ubuntu/cups/bzr/build-area/cups-1.5.2$ fc-match
> FreeMono.ttfDejaVuSans.ttf: "DejaVu Sans" "Book"

But the page wasn't printed in "DejaVu Sans" then?

 - Fabian

Message #35 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Till Kamppeter <till.kamppeter@gmail.com>

To: Fabian Greffrath <fabian@greffrath.com>

Cc: Martin Pitt <mpitt@debian.org>, 662660@bugs.debian.org

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Tue, 06 Mar 2012 16:54:32 +0100

[Message part 1 (text/plain, inline)]

On 03/06/2012 03:57 PM, Fabian Greffrath wrote:
> Am 06.03.2012 15:42, schrieb Till Kamppeter:
>> till@till-precise:~/ubuntu/cups/bzr/build-area/cups-1.5.2$ fc-match
>> FreeMono.ttfDejaVuSans.ttf: "DejaVu Sans" "Book"
>
> But the page wasn't printed in "DejaVu Sans" then?
>
> - Fabian
>

Attached is the file which I originally sent to the printer and the 
scanned printout.

I am on Ubuntu Precise (12.04). I have uninstalled the ttf-freefont and 
removed the symlinks:

sudo dpkg -P --force-depends ttf-freefont
sudo rm /usr/share/cups/fonts/FreeMono*

   Till

[scanned-printout-debian-662660.pdf (application/pdf, attachment)]

[.bashrc (text/plain, attachment)]

Message #40 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Fabian Greffrath <fabian@greffrath.com>

To: Till Kamppeter <till.kamppeter@gmail.com>

Cc: Martin Pitt <mpitt@debian.org>, 662660@bugs.debian.org

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Tue, 06 Mar 2012 17:26:44 +0100

Am 06.03.2012 16:54, schrieb Till Kamppeter:
> Attached is the file which I originally sent to the printer and the
> scanned printout.

The printout looks as if all glyphs have been arranged in a fixed 
raster, since a monospaced font is expected, but the font actually 
used is proportional, i.e. "DejaVu Sans" "Book". This needs fixing in 
my patch...

> sudo dpkg -P --force-depends ttf-freefont
> sudo rm /usr/share/cups/fonts/FreeMono*

What happend if you manually bend the symlinks to, say, Liberation Mono?

 - Fabian

Message #45 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Till Kamppeter <till.kamppeter@gmail.com>

To: Fabian Greffrath <fabian@greffrath.com>

Cc: Martin Pitt <mpitt@debian.org>, 662660@bugs.debian.org

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Tue, 06 Mar 2012 17:32:42 +0100

I have tried this now:

till@till-precise:~/ubuntu/cups/bzr/build-area/cups-1.5.2$ ls -l 
/usr/share/cups/fonts/
total 16
lrwxrwxrwx 1 root root 66 Mar  6 17:29 FreeMonoBoldOblique.ttf -> 
/usr/share/fonts/truetype/liberation/LiberationMono-BoldItalic.ttf
lrwxrwxrwx 1 root root 60 Mar  6 17:30 FreeMonoBold.ttf -> 
/usr/share/fonts/truetype/liberation/LiberationMono-Bold.ttf
lrwxrwxrwx 1 root root 62 Mar  6 17:30 FreeMonoOblique.ttf -> 
/usr/share/fonts/truetype/liberation/LiberationMono-Italic.ttf
lrwxrwxrwx 1 root root 63 Mar  6 17:29 FreeMono.ttf -> 
/usr/share/fonts/truetype/liberation/LiberationMono-Regular.ttf
till@till-precise:~/ubuntu/cups/bzr/build-area/cups-1.5.2$

Now a correct printout came out.

   Till

Message #50 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Fabian Greffrath <fabian@greffrath.com>

To: Till Kamppeter <till.kamppeter@gmail.com>

Cc: Martin Pitt <mpitt@debian.org>, 662660@bugs.debian.org

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Tue, 06 Mar 2012 17:42:46 +0100

Am 06.03.2012 17:32, schrieb Till Kamppeter:
> Now a correct printout came out.

Thanks for trying! So valid candidate fonts must be both TrueType and 
monospaced. Please expect an improved patch tomorrow. ;)

Bye,
Fabian

Message #55 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Fabian Greffrath <fabian@greffrath.com>

To: Till Kamppeter <till.kamppeter@gmail.com>

Cc: Martin Pitt <mpitt@debian.org>, 662660@bugs.debian.org

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Wed, 07 Mar 2012 10:30:15 +0100

[Message part 1 (text/plain, inline)]

Hi Till and Martin,

please find my improved patch attached.

If direct loading of the TTF font file passed to font_load() fails, 
turn the file name into a fontconfig "pattern" (see below!) and use it 
to receive a list of similar fonts from fontconfig that somehow match 
this pattern. Then iterate through this list to find the first 
candidate that is both in TrueType format and monospaced. If none is 
found, fontname will still point to NULL and the function returns NULL 
just as before.

With this patch, texttopdf should work whether ttf-freefonts is 
installed or not, whether the symlinks are there or not, whether they 
are dangling or not - it just shouldn't matter, *as long as at least 
on monospaced TrueType font is installed on the system*. This may be 
provided by fonts-liberation, ttf-dejavu, fonts-consolidata or 
whatever. However, if ttf-freefonts is installed, the symlinks will 
point to these fonts and they take preference over all the others. I 
think this still makes sense, because ttf-freefonts may still have the 
widest unicode coverage of them all. I think this fact should also get 
reflected in the package dependencies, which could get changed from 
"Depends: ttf-freefonts" to "Depends: ttf-freefonts | fonts-liberation 
| ttf-dejavu" or similar. This would close #662660 and #495598. ;)

There is one drawback with this patch (but I think the net win 
overweights): The file names passed to font_load() are in fact no 
valid fontconfig patterns, even with their .ttf extensions removed. 
That is, fontconfig cannot know that "FreeMonoBold"  means that we 
want the bold face of the FreeMono or any other valid monospaced font. 
I should be called "FreeMono:Bold" to achieve this, but this in turn 
is incompatible with the file names found in ttf-freefonts. I think it 
still works well enough as a fallback as it is now, but in the long 
term one should consider switching from actual font file names to 
fontconfig patterns in pdf.utf-8.* altogether!

Another warning: This is my very first encounter with fontconfig, so I 
suggest someone with a bit more fontconfig-fu should have a look at it 
before applying it upstream. ;)

Regards,
 - Fabian


PS: The cups-filters package currently FTBFS if built twice in a row, 
because there are object files left in pdftoopvp/oprs/ and 
filter/fontembed/. Maybe those two directories should get added to the 
DIRS variable in the top-level Makefile.

[texttopdf_fontconfig.patch (text/x-diff, attachment)]

Message #60 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Till Kamppeter <till.kamppeter@gmail.com>

To: Fabian Greffrath <fabian@greffrath.com>

Cc: Martin Pitt <mpitt@debian.org>, 662660@bugs.debian.org

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Wed, 07 Mar 2012 10:47:45 +0100

Thank you very much. This patch works correctly now. I have committed it 
to the upstream BZR repository of cups-filters.

It will go into the next Debian/Ubuntu package, probably later today.

Patches to use fontconfig patterns in the pdf.utf-8.* files are welcome.

   Till

Message #65 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Fabian Greffrath <fabian@greffrath.com>

To: Till Kamppeter <till.kamppeter@gmail.com>

Cc: Martin Pitt <mpitt@debian.org>, 662660@bugs.debian.org

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Wed, 07 Mar 2012 12:12:51 +0100

[Message part 1 (text/plain, inline)]

Am 07.03.2012 10:47, schrieb Till Kamppeter:
> Patches to use fontconfig patterns in the pdf.utf-8.* files are welcome.

Here you are.

Please note that these pdf.utf-8.* files obsolete the removal of the 
file extensions in my previous patch.

 - Fabian

[pdf.utf8.patch (text/x-diff, attachment)]

Message #70 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Fabian Greffrath <fabian@greffrath.com>

To: Till Kamppeter <till.kamppeter@gmail.com>

Cc: Martin Pitt <mpitt@debian.org>, 662660@bugs.debian.org

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Wed, 07 Mar 2012 13:05:50 +0100

Am 07.03.2012 12:12, schrieb Fabian Greffrath:
> Please note that these pdf.utf-8.* files obsolete the removal of the
> file extensions in my previous patch.

Moreover, if you decide to switch the pdf.utf-8.* files from font file 
names to fontconfig patterns, this will not only make the symlinks and 
the first attempt to open them in texttopdf.c obsolete -- they will 
make it definitely fail. So maybe this code should get refactored as well.

 - Fabian

Message #75 received at 662660-close@bugs.debian.org (full text, mbox, reply):

From: Martin Pitt <mpitt@debian.org>

To: 662660-close@bugs.debian.org

Subject: Bug#662660: fixed in cups-filters 1.0.4-1

Date: Wed, 07 Mar 2012 13:47:55 +0000

Source: cups-filters
Source-Version: 1.0.4-1

We believe that the bug you reported is fixed in the latest version of
cups-filters, which is due to be installed in the Debian FTP archive:

cups-filters_1.0.4-1.debian.tar.gz
  to main/c/cups-filters/cups-filters_1.0.4-1.debian.tar.gz
cups-filters_1.0.4-1.dsc
  to main/c/cups-filters/cups-filters_1.0.4-1.dsc
cups-filters_1.0.4-1_amd64.deb
  to main/c/cups-filters/cups-filters_1.0.4-1_amd64.deb
cups-filters_1.0.4.orig.tar.gz
  to main/c/cups-filters/cups-filters_1.0.4.orig.tar.gz
libcupsfilters-dev_1.0.4-1_amd64.deb
  to main/c/cups-filters/libcupsfilters-dev_1.0.4-1_amd64.deb
libcupsfilters1_1.0.4-1_amd64.deb
  to main/c/cups-filters/libcupsfilters1_1.0.4-1_amd64.deb



A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 662660@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Martin Pitt <mpitt@debian.org> (supplier of updated cups-filters package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Format: 1.8
Date: Wed, 07 Mar 2012 14:36:49 +0100
Source: cups-filters
Binary: libcupsfilters1 cups-filters libcupsfilters-dev
Architecture: source amd64
Version: 1.0.4-1
Distribution: unstable
Urgency: low
Maintainer: Debian CUPS Maintainers <pkg-cups-devel@lists.alioth.debian.org>
Changed-By: Martin Pitt <mpitt@debian.org>
Description: 
 cups-filters - OpenPrinting CUPS Filters
 libcupsfilters-dev - OpenPrinting CUPS Filters - Development files for the library
 libcupsfilters1 - OpenPrinting CUPS Filters - Shared library
Closes: 495598 661127 662295 662660
Changes: 
 cups-filters (1.0.4-1) unstable; urgency=low
 .
   [ Till Kamppeter ]
   * New upstream release
     - cups-filters 1.0.4 release
     - texttopdf: Fall back to altermative fonts via fontconfig if the
       FreeMono TrueType fonts are not installed (Closes: #495598,
       Closes: #662660).
     - bannertopdf: Fix off-by-one error in page duplication
     - bannertopdf: Put indirect references to streams into the page's
       contents
     - bannertopdf: Let byte offsets for the Xref table of the PDF output
       being determined correctly also when the output goes to stdout
       (LP: #939735).
     - bannertopdf: Output multiple copies of the test page if duplex
       and/or N-up is chosen, to let the test page appear on all possible
       positions of the sheet (LP: #939530).
     - bannertopdf: Scale test page template to fit the job's page size,
       get and display full page geometry information, draw the frame which
       marks the printable area 1pt smaller, to assure that it gets completely
       visible (LP: #921073).
   * debian/local/default-testpage.pdf: Added missing "Q" operator to the end of
     the page. This broke N-up printing with pdftopdf (LP: #939530).
   * debian/control: Added explicit build dependency on libfontconfig1-dev.
     (Closes: #661127)
   * debian/control: Changed font dependency (for texttopdf) to "ttf-freefont |
     fonts-liberation | ttf-dejavu" instead of only "ttf-freefont"
     (Closes: #495598, Closes: #662660).
 .
   [ Martin Pitt ]
   * debian/control: Build against libpng-dev, with an alternative to the older
     libpng12-dev. (Closes: #662295)
   * debian/control: Prefer building against libtiff5-dev if available, falling
     back to libtiff-dev.
   * debian/control, debian/rules: Move from hardening-wrapper to using
     dpkg-buildflags. Bump dpkg-dev build dependency to (>= 1.16.1~) for this.
   * debian/copyright: Update Format header for official copyright format 1.0.
   * debian/control: Bump Standards-Version to 3.9.3.
   * debian/rules: Drop LC_MESSAGES setting, leftover from cups.
   * debian/control: Bump libcupsimage2-dev build dependency to ensure to build
     against a version which does not conflict on the libtiff?-dev build
     dependency.
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Message #80 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Fabian Greffrath <fabian@greffrath.com>

To: Till Kamppeter <till.kamppeter@gmail.com>

Cc: Martin Pitt <mpitt@debian.org>, 662660@bugs.debian.org

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Wed, 07 Mar 2012 16:28:34 +0100

Am 07.03.2012 13:05, schrieb Fabian Greffrath:
> make it definitely fail. So maybe this code should get refactored as
> well.

It is, I have attached two more patches.

Please apply the first one "font-index.patch" in any case, regardless 
of your decision to use font file names or fontconfig patterns in 
pdf.utf-8.*! It appends the index of the font in the font file to its 
filename, which gets passed over to otf_load(). It is gracefully 
ignored for .ttf files, i.e. in 99.9% percent of all cases but 
strictly required for .ttc files. It is thus crucial if you want to 
replace the "uming.ttc/0" entry in pdf.utf-8.heavy with a 
corresponding fontconfig pattern.

The second patch "fontconfig-patterns.patch" entirely removes the 
attempt to directly load font files from the $datadir/fonts directory 
and relies on fontconfig instead. Of course, it requires application 
of "pdf.utf-8.patch" which I sent in my previous mail and which 
replaced all the font file names in pdf.utf-8.* with corresponding 
fontconfig patterns, though.

Best Regards,
Fabian

Message #85 received at 662660@bugs.debian.org (full text, mbox, reply):

From: Fabian Greffrath <fabian@greffrath.com>

To: Till Kamppeter <till.kamppeter@gmail.com>

Cc: Martin Pitt <mpitt@debian.org>, 662660@bugs.debian.org

Subject: Re: [Pkg-cups-devel] Bug#662660: cups-filters: Please drop ttf-freefonts and use fontconfig to find the best-matching similar font

Date: Wed, 07 Mar 2012 16:29:13 +0100

[Message part 1 (text/plain, inline)]

Am 07.03.2012 16:28, schrieb Fabian Greffrath:
> It is, I have attached two more patches.

[fontconfig-patterns.patch (text/x-diff, attachment)]

[font-index.patch (text/x-diff, attachment)]

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