[11855] in Perl-Users-Digest
Perl-Users Digest, Issue: 5456 Volume: 8
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Thu Apr 22 15:07:24 1999
Date: Thu, 22 Apr 99 12:01:31 -0700
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Thu, 22 Apr 1999 Volume: 8 Number: 5456
Today's topics:
Re: newbie with a "howto" question <cassell@mail.cor.epa.gov>
Re: newbie with a "howto" question <emschwar@rmi.net>
Re: NT/Processes/IDs <ukirazci@fore.com>
Re: NT/Processes/IDs <gregm@well.com>
Re: Perl & CGI Sites Needed <cassell@mail.cor.epa.gov>
Re: PERL and HTTP links (Clinton Pierce)
Re: Reading C binary data from disk <uri@sysarch.com>
Re: Reading C binary data from disk <tchrist@mox.perl.com>
Re: Script to tidy/format a C file <myke98@my-dejanews.com>
Sending binary values? (Neil Cherry)
Re: Telnet problems scott@sboss.net
Re: The Future of Tk? <barmar@bbnplanet.com>
Re: The Future of Tk? (Kaz Kylheku)
Re: The Future of Tk? <robin@jessikat.demon.co.uk>
Re: The Future of Tk? <barmar@bbnplanet.com>
Re: To trim right blanks from a field. <cassell@mail.cor.epa.gov>
Special: Digest Administrivia (Last modified: 12 Dec 98 (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Thu, 22 Apr 1999 11:20:37 -0700
From: David Cassell <cassell@mail.cor.epa.gov>
Subject: Re: newbie with a "howto" question
Message-Id: <371F6875.FDB43CEC@mail.cor.epa.gov>
derose@my-dejanews.com wrote:
>
> Hello,
>
> I'm new at Perl, and don't really have the patience's to find the answers in
> my books, so I thought I would ask some experts.
And how is it that your time is more valuable than an entire newsgroup
of experts? This doesn't sound very polite. Patience is a virtue,
especially for a programmer. When you hear that LArry Wall described
the three great virtues of a programmer as Laziness, Impatience, and
Hubris, be aware that this is not what he had in mind.
Actually, your questions have basically been answered in the Perl
documentation that cmae with your install. If you don't have the
time to read all 1200 pages of docs, learn to use the really nice
toys that come with the docs. Try the following commands, and
see what niftiness awaits you:
perldoc perldoc
perldoc perl
perldoc -q uniq [or perldoc -q unique]
perldoc -f split
> I have two questions really
> 1. Is there a comparable command or module to unix's uniq? I want to sort and
> uniq a simple text file. I've figured out how to sort it in Perl, but not how
> to uniq it. If I were to do this in shell I would say something like:
> cat $file1 | sort | uniq > $outfile
By now you have tried `perldoc -q uniq' and read the FAQ and found
that it is easy to do in Perl using a hash.
> 2. Is there a module or function that will parse a line in a text file? I
> have a file with four individual columns, and I want to read each line on at
> a time and have each word placed in an individual variable. If I were to do
> this in shell, I would have used awk to parse the lines.
By now you have tried `perldoc -f split' and found that there is at
least one way to do this in Perl. But there are lots of ways.
Read the perlrun manpage and find out about the command line options.
So you could try something like
perl -wane 'print pop(@F), "\n";' filename
and see how Perl does autosplit.
Or you could use the a2p program and see what sort of code you get
if you convert an awk script to a Perl program.
TMTOWTDI.
> If any one could point me in the correct direction, I would appreciate it.
>
> Thank you.
You're welcome.
And remember that in general posters to this newsgroup are expected
to have done their homework first, or else one of the `experts'
may flame them instead of spoon-feeding them. :-)
HTH,
David
--
David Cassell, OAO
cassell@mail.cor.epa.gov
Senior Computing Specialist phone: (541)
754-4468
mathematical statistician fax: (541)
754-4716
------------------------------
Date: 22 Apr 1999 12:48:46 -0600
From: Eric The Read <emschwar@rmi.net>
Subject: Re: newbie with a "howto" question
Message-Id: <xkfhfq8ij8x.fsf@valdemar.col.hp.com>
derose@my-dejanews.com writes:
> I'm new at Perl, and don't really have the patience's to find the answers in
> my books, so I thought I would ask some experts.
IOW, you couldn't be bothered to look up the explanation yourself, so you
thought it'd be much nicer to ask other people to do your work for you,
and for free, too. Gee, how kind.
> I have two questions really
> 1. Is there a comparable command or module to unix's uniq?
> 2. Is there a module or function that will parse a line in a text file?
No. Nobody has ever needed to do this in perl. One of the most powerful
text-processing languages in history has never found the need to
implement the ability to parse a line in a text file, or find out which
lines in a file are unique. They certainly wouldn't have put it in the
documentation that came with your distribution of perl when you
downloaded it. That would be too easy-- even if they had implemented it,
which they haven't. And even if they had put it in the documentation,
they'd never make it simple for you to just go in there and grep for it.
Nope, just can't be done. Sorry. You want comp.lang.too.lazy.to.read.
It's just down the hall, to the left.
-=Eric
------------------------------
Date: 22 Apr 1999 18:50:48 GMT
From: "Ulas Kirazci" <ukirazci@fore.com>
Subject: Re: NT/Processes/IDs
Message-Id: <7fnr28$mrt$16@newsread.f.de.uu.net>
tlist [/t]
ulas
Susanne Schmidt <banshee@zedat.fu-berlin.de> wrote in article
<7fncbk$574$2@fu-berlin.de>...
> Hello all,
> i have to solve a problem under Win-NT within a perlscript: a perlscript
> should be scheduled from "at" at xx o`clock - but only if the run before
> is not still running. I can`t calculate the time for one script-run, so i
> have to look for the running process - how to do that under NT ?! (i just
> know UNIX..) Is there any module for showing running processes ? Does NT
> have processes ? ;) can i get them as a list? send signals ? GET AN ID ?
:)
>
> Maybe it`s the complete wrong idea - where do i have to look ?
>
> Thank you for any idea!
>
> Susanne
>
> --
> Frauen sagen "ja" zu Linux!
> banshee@linux.de
>
------------------------------
Date: 22 Apr 1999 18:50:50 GMT
From: Greg McCann <gregm@well.com>
Subject: Re: NT/Processes/IDs
Message-Id: <7fnr2a$mrt$18@newsread.f.de.uu.net>
Susanne Schmidt wrote:
>
> Hello all,
> i have to solve a problem under Win-NT within a perlscript: a perlscript
> should be scheduled from "at" at xx o`clock - but only if the run before
> is not still running. I can`t calculate the time for one script-run, so i
> have to look for the running process - how to do that under NT ?! (i just
> know UNIX..) Is there any module for showing running processes ? Does NT
> have processes ? ;) can i get them as a list? send signals ? GET AN ID ? :)
I don't know how to get at the NT PIDs, but how about a workaround? When your
process starts, write an "I'm running now" flag file to disk, and then delete it
when you are finished. When you want to start your second process, just check
for the existence of the flag file and proceed accordingly.
Of course there must be some way to do it, since you can see the list of all
current NT PIDs in the Task Manager, but a quick check of my Perl docs,
including the Win32 Resource Kit, doesn't reveal any way to do it in Perl.
Greg
------------------------------
Date: 22 Apr 1999 18:50:43 GMT
From: David Cassell <cassell@mail.cor.epa.gov>
Subject: Re: Perl & CGI Sites Needed
Message-Id: <7fnr23$mrt$11@newsread.f.de.uu.net>
Planet CGI wrote:
>
> Perl & CGI Sites Needed
>
> If you own or operate a Perl or CGI related web site, you may now receive
> free banner advertising to increase traffic to your site by joining the
> Planet CGI Banner Exchange.
And I quote: "What a bargain for me!"
> This banner exchange is similar to other banner exchanges such as the Link
> Exchange, but is reserved only for Perl or CGI related web sites.
>
> To join, go to:
> [SNIP]
See Tad? Like I said. "Perl" == "CGI" [sic]
Everyone out there knows this except us, apparently.
HAND,
David
--
David Cassell, OAO
cassell@mail.cor.epa.gov
Senior Computing Specialist phone: (541)
754-4468
mathematical statistician fax: (541)
754-4716
------------------------------
Date: 22 Apr 1999 18:51:00 GMT
From: cpierce1@ford.com (Clinton Pierce)
Subject: Re: PERL and HTTP links
Message-Id: <7fnr2k$mrt$25@newsread.f.de.uu.net>
On 22 Apr 1999 16:57:52 GMT, Patrick M. Geahan <pmgeahan@mtu.edu> wrote:
>I'd like to set up a sort of anonymizer. The place I work keeps a firewall
>that keeps track of all hits - i.e., telnet counts as one, but each HTTP
>hit counts as one, as well. I'd like to write a CGI script tfor my home
>Linux box.
Ummm...no moral judgements here...but your employer has a firewall that
keeps track of these things for a purpose, right? Think about your
employers AUP before doing this. :-)
>That way, I can load up a certain page, enter something into a
>text box, and have the page load that URL. However, the unfortunate
>problem comes when I click on a link in the page I load. [...]
You will need to parse the second page and re-write all of its links in
the CGI. It's not hard, but don't post here asking how to do that. It's
an FAQ.
--
Clinton A. Pierce "If you rush a Miracle Man, you get rotten
clintp@geeksalad.org Miracles." -- Miracle Max, The Princess Bride
http://www.geeksalad.org
------------------------------
Date: 22 Apr 1999 14:25:04 -0400
From: Uri Guttman <uri@sysarch.com>
Subject: Re: Reading C binary data from disk
Message-Id: <x77lr4cy2n.fsf@home.sysarch.com>
>>>>> "LR" == Larry Rosler <lr@hpl.hp.com> writes:
LR> I wonder if there isn't a design flaw in the read() or sysread()
LR> functions implemented for the Evil Empire. Analogous to C's fread,
LR> shouldn't they automatically give back all the bytes as they exist on
LR> the external medium, instead of converting "\015\012" pairs to "\n"? An
LR> implicit binmode(), in effect, to help eliminate these recurrent bugs.
LR> The line-at-a-time input operators <> and readline() wouldn't be
LR> affected by this change.
i am no expert on the evil os (thank god!), but i believe perl's binmode
calls a winblows system call to affect its conversion of cr/lf to
\n. this is needed for c programs too as c uses the \n convention. so
having perl's read and sysread do an implicit bin mode makes little
sense. they don't know what the programmer is doing (and if the
programmer is using winblows, he doesn't know what he is doing either
:-), so they can't always turn on binmode.
just trying to help out those poor POB's,
uri
--
Uri Guttman ----------------- SYStems ARCHitecture and Software Engineering
uri@sysarch.com --------------------------- Perl, Internet, UNIX Consulting
Have Perl, Will Travel ----------------------------- http://www.sysarch.com
The Best Search Engine on the Net ------------- http://www.northernlight.com
------------------------------
Date: 22 Apr 1999 12:43:17 -0700
From: Tom Christiansen <tchrist@mox.perl.com>
Subject: Re: Reading C binary data from disk
Message-Id: <371f6dc5@cs.colorado.edu>
[courtesy cc of this posting sent to cited author via email]
In comp.lang.perl.misc,
lr@hpl.hp.com (Larry Rosler) writes:
:I wonder if there isn't a design flaw in the read() or sysread()
:functions implemented for the Evil Empire. Analogous to C's fread,
:shouldn't they automatically give back all the bytes as they exist on
:the external medium, instead of converting "\015\012" pairs to "\n"?
Yes, it's a bug, but it's a bug from the Evil One in their C code, and
one apparently we're not allowed to fix it. It's nestled deep down
in the bowels of their hideous run-time system.
I, too, long believed as you believed, so when the light of truth
finally shone upon their profound iniquity, a non-trivail clean-up
job was required to rescue the random documentation (like peropentut),
as well as the ensuing mess on my hardwood floors.
That is not dead which can fternal lie,
and in strange fons, even CP/M may die.
--Abdulw Al-Lhazard
--tom
--
When the dinosaurs are mating, climb a tree. --Steve Johnson
------------------------------
Date: 22 Apr 1999 18:50:46 GMT
From: Myke <myke98@my-dejanews.com>
Subject: Re: Script to tidy/format a C file
Message-Id: <7fnr26$mrt$13@newsread.f.de.uu.net>
In article <MPG.1188385b780f533e98990a@nntp.hpl.hp.com>,
lr@hpl.hp.com (Larry Rosler) wrote:
> The command `man 1 cb` on my HP-UX system produces this:
>
> cb(1)
>
> NAME
> cb - C program beautifier, formatter
>
> I don't know how widely distributed this program is, but it's been
> around for decades. Long before Perl.
Thanks, I didn't know about 'cb' but having just gone through it, it doesn't
exactly do what I want/hoped for.
> > If it doesn't exist then I may take this opportunity to learn Perl and write
> > the script myself. But before I do so I wanted to ask if such a script
> > already existed, and also, can Perl handle such a task?
>
> Yes, of course it can. But why bother?
Well, I wanted to allow a little more flexibility such as having
user-definable formatting options. Examples would be whether or not opening
braces '{' would be on the same line as the control block, or whether they
started on a new line, and if on a new line, would they be indented or not.
What's the indent width? Should tabs be for indenting or padded spaces?
Should comment blocks be indented? Stuff like that.
--
m y k e
how ya gonna win when ya ain't right within?
-----------== Posted via Deja News, The Discussion Network ==----------
http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own
------------------------------
Date: 22 Apr 1999 18:50:58 GMT
From: njc@dmc.uucp (Neil Cherry)
Subject: Sending binary values?
Message-Id: <7fnr2i$mrt$24@newsread.f.de.uu.net>
First I'm more of an assembly/C language hacker (working under Linux
on an i86 box). I have a feeling that I'm not quite undestanding one
thing in Perl. I've tried to use pack and unpack but I have idea what
I'm getting out of them.
I have an array filled with such:
$a[0] = 0x24;
$a[1] = 0x05;
$a[2] = 0x00;
$a[3] = 0x01;
Now if I attempt to syswrite these values out to a file I get the string:
3501 (0x33 0x35 0x33 0x31)
I want:
!^E^@^A (that 4 character 0x24 0x05 0x00 0x01).
How do I accomplish this (it's driving me nuts)?
BTW I can send "!^E^@^A" but I have no idea how to create the string
(I'm getting this from localtime and need to convert it to a string
with a magic sequence and the the BCD rep of the time values).
--
Linux Home Automation Neil Cherry ncherry@home.net
http://members.home.net/ncherry (Text only)
http://meltingpot.fortunecity.com/lightsey/52 (Graphics GB)
http://www2.cybercities.com/~linuxha/ ( DOWN )
------------------------------
Date: 22 Apr 1999 18:50:55 GMT
From: scott@sboss.net
Subject: Re: Telnet problems
Message-Id: <7fnr2f$mrt$22@newsread.f.de.uu.net>
In article <371F3C19.DA0F1A30@no.spam.technologist.com>,
Michael Cameron <Michael.Cameron@no.spam.technologist.com> wrote:
> scott@sboss.net wrote:
>
> You do not mention what machine you are using. I used the expect module on
> Solaris and had to change some of the values in the perl headers,
> unfortunately that was some time ago and I no longer ave access to the system
> in question. You might find that you need to tweak a few things for Net:telnet
> too. Failing that you could always implement the same thing using the expect
> module to drive a telnet.
>
> HTH,
>
> Michael
Michael,
Thanks for helping me. I am running the script on a RedHat 5.2 (PII-400)
with the default Perl that comes with RH5.2. I am connecting via the eth0
(3c90x card) to the ethernet to my Sun & HP boxes (all in other states but on
the network - not subnet). Some versions of the program that I am writing
(where I am changing the telnet part of the code over and over again) I get
past the login/password and sometimes I don't. It is always get to the same
place on the same code but when I change the code is when how far I get
changes. _ _ | | [Suns] [Linux]---| | [HPs] 201
subnet|----[Router(s)]---| 245 subnet | | _ _
I can use the telnet command via linux and connect without a problem.
Thanks again,
Scott
>
>
--
Scott Boss
Atlanta Perl Mongers Fearless Leader
website: http://atlanta.pm.org
community: http://www.dejanews.com/~apm
-----------== Posted via Deja News, The Discussion Network ==----------
http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own
------------------------------
Date: Thu, 22 Apr 1999 18:01:27 GMT
From: Barry Margolin <barmar@bbnplanet.com>
Subject: Re: The Future of Tk?
Message-Id: <XtJT2.124$fQ1.12097@burlma1-snr2>
In article <4fv$ECA+JyH3EwbN@jessikat.demon.co.uk>,
Robin Becker <robin@jessikat.demon.co.uk> wrote:
>I take this completely differently; least astonishment for me is if
>program X looks and behaves the same way no matter what keyboard, mouse
>and screen I'm using. As a 'user' of the program X it shouldn't matter
>what OS/WM is executing the code. I certainly don't want vi or emacs to
>be different on the mac why should I treat word or excel differently?
I would be very surprised if Netscape on the Macintosh presented a
Windows-like user interface, rather than adopting the standard Macintosh
user interface. Most end users don't switch between platforms much, so
it's more important that all the programs on their system conform to their
expectations, than that a particular program work the same across different
platforms.
--
Barry Margolin, barmar@bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.
------------------------------
Date: Thu, 22 Apr 1999 18:22:32 GMT
From: kaz@ashi.FootPrints.net (Kaz Kylheku)
Subject: Re: The Future of Tk?
Message-Id: <slrn7huq78.2a7.kaz@ashi.FootPrints.net>
On Thu, 22 Apr 1999 18:01:27 GMT, Barry Margolin <barmar@bbnplanet.com> wrote:
>In article <4fv$ECA+JyH3EwbN@jessikat.demon.co.uk>,
>Robin Becker <robin@jessikat.demon.co.uk> wrote:
>>I take this completely differently; least astonishment for me is if
>>program X looks and behaves the same way no matter what keyboard, mouse
>>and screen I'm using. As a 'user' of the program X it shouldn't matter
>>what OS/WM is executing the code. I certainly don't want vi or emacs to
>>be different on the mac why should I treat word or excel differently?
>
>I would be very surprised if Netscape on the Macintosh presented a
>Windows-like user interface, rather than adopting the standard Macintosh
I'd be very surprised if even 10% of, say, comp.lang.c gave a damn. The pitiful
dumbfuck who started this thread made a severe mistake in constructing the
Newsgroups: header line, the moment he put in the first comma.
I am setting Followup-to: to comp.lang.tcl.
------------------------------
Date: 22 Apr 1999 18:50:51 GMT
From: Robin Becker <robin@jessikat.demon.co.uk>
Subject: Re: The Future of Tk?
Message-Id: <7fnr2b$mrt$19@newsread.f.de.uu.net>
In article <371F11C2.3162025@ciril.fr>, Frederic BONNET
<frederic.bonnet@ciril.fr> writes
>Hi,
>
>Eugene Dragoev wrote:
>[...]
>> But I also found that while older versions of Tk were using lightweight
...
>> Is there going to be any Tk implementation that will continue using
>> lightweight components?
>
>By lightweight I guess you mean emulated in some way. I don't think that
>cross-platform look&feel consistency is a good thing. As a GUI designer
>I'd rather follow the principle of least astonishment: an app running on
>Windows should look and feel like a Windows app. The same app running on
>MacOS and X should do the same on the respective platforms. Such a
>cross-platform application is not supposed to look and feel the same on
>all platforms. If users want to use the same app on several platforms,
...
I take this completely differently; least astonishment for me is if
program X looks and behaves the same way no matter what keyboard, mouse
and screen I'm using. As a 'user' of the program X it shouldn't matter
what OS/WM is executing the code. I certainly don't want vi or emacs to
be different on the mac why should I treat word or excel differently?
Another reason for having a Tk look and feel is that it allows widget
behaviours different from those allowed by the underlying 'convention'.
Of course those with an interest in the survival of rigid wm systems
prefer we should adhere to their conventions. The only changes then come
from the suppler of such systems and are introduced to make us by new
versions etc.
Competition between different WM's is currently almost impossible
because of the original model ie the 'toplevel' is controlled and
decorated by the WM. We don't have to do that with the widgets inside
the 'toplevel' so why do we? Let 100 flowers bloom etc.
...
>And I don't speak about look differences.
>
>See you, Fred
--
Robin Becker
------------------------------
Date: 22 Apr 1999 18:51:01 GMT
From: Barry Margolin <barmar@bbnplanet.com>
Subject: Re: The Future of Tk?
Message-Id: <7fnr2l$mrt$26@newsread.f.de.uu.net>
In article <4fv$ECA+JyH3EwbN@jessikat.demon.co.uk>,
Robin Becker <robin@jessikat.demon.co.uk> wrote:
>I take this completely differently; least astonishment for me is if
>program X looks and behaves the same way no matter what keyboard, mouse
>and screen I'm using. As a 'user' of the program X it shouldn't matter
>what OS/WM is executing the code. I certainly don't want vi or emacs to
>be different on the mac why should I treat word or excel differently?
I would be very surprised if Netscape on the Macintosh presented a
Windows-like user interface, rather than adopting the standard Macintosh
user interface. Most end users don't switch between platforms much, so
it's more important that all the programs on their system conform to their
expectations, than that a particular program work the same across different
platforms.
--
Barry Margolin, barmar@bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.
------------------------------
Date: Thu, 22 Apr 1999 11:06:00 -0700
From: David Cassell <cassell@mail.cor.epa.gov>
Subject: Re: To trim right blanks from a field.
Message-Id: <371F6508.267D9F79@mail.cor.epa.gov>
kalash4334@my-dejanews.com wrote:
>
> I am looking for a function to trim the right spaces from a field of one line.
> i.e.
>
> my file is like
> <jsfkjsh skdhfkshflk sdjfhsjkhfsdhf sdkhfklsh lkshflksj
> uyfjfhj hvhjvj jhgjg nbvvbbjkb mnbbkjbbkjj>
>
> I used substr function to break these columns in different variables by
> giving position.
Oh. Well, that's not the way I would have chosen to do it.
C'est la vie.
> Now I want to remove the right spaces to make the file in
> this format:
>
> jsfkjsh skdhfkshflk sdjfhsjkhfsdhf sdkhfklsh lkshflksj
> uyfjfhj hvhjvj jhgjg nbvvbbjkb mnbbkjbbkjj
>
> I tried Trim($variable_name) but I am getting this error
> Undefined subroutine &main::Trim called at a.pl line 31, <> line 2.
Perl is telling you that there is no `Trim' function or subroutine
available. Have you written one yourself, and neglected to import
it properly? Because there is no trim [note the lack of capitals]
function in Perl. This is not BASIC or SAS. You can read the
perlfunc manpage [type `perldoc perlfunc' at the command prompt]
to see the details on the Perl functions.
> Can someone suggest a solution.
Yes. tr/// will do this for you very nicely. This could also be
done using a regex, but that will likely be a lot slower than the
tr solution. tr works like the unix tr(1), only better.
HTH,
David
--
David Cassell, OAO
cassell@mail.cor.epa.gov
Senior Computing Specialist phone: (541)
754-4468
mathematical statistician fax: (541)
754-4716
------------------------------
Date: 12 Dec 98 21:33:47 GMT (Last modified)
From: Perl-Request@ruby.oce.orst.edu (Perl-Users-Digest Admin)
Subject: Special: Digest Administrivia (Last modified: 12 Dec 98)
Message-Id: <null>
Administrivia:
Well, after 6 months, here's the answer to the quiz: what do we do about
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]From: Russ Allbery <rra@stanford.edu>
]Date: 21 Sep 1998 19:53:43 -0700
]Subject: comp.lang.perl.moderated available via e-mail
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End of Perl-Users Digest V8 Issue 5456
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