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Perl-Users Digest, Issue: 5738 Volume: 8

daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Fri May 21 00:08:08 1999

Date: Thu, 20 May 99 21:00:16 -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, 20 May 1999     Volume: 8 Number: 5738

Today's topics:
        -w does not work on W32? <pkotala@logis.cz>
    Re: constants question <cassell@mail.cor.epa.gov>
    Re: FAQ 8.1: How do I find out which operating system I <mds-resource@mediaone.net>
        File::Copy <roland@oco.net>
    Re: Forking and sleeping. <jdf@pobox.com>
        How about two arrays? [Was: Blasting array into hash ?? <mpersico@erols.com>
    Re: How about two arrays? [Was: Blasting array into has (Mike Stok)
    Re: Is it a file or a link? (John Horne)
        killing a perl CGI on NT <memberjh@yahoo.com>
    Re: Merge MS Word documents <cassell@mail.cor.epa.gov>
        Perl compiler...If or when <corus@my-dejanews.com>
    Re: Perl compiler...If or when (Randal L. Schwartz)
    Re: Sorting a Multi-dimensional array by specific eleme (Tad McClellan)
        stripping text with regex ainsoph@propaganda-arts.org
    Re: stripping text with regex <mds-resource@mediaone.net>
    Re: stripping text with regex <memberjh@yahoo.com>
    Re: stripping text with regex <JFedor@datacom-css.com>
    Re: Win32 Build Vs. Unix Build!!! <cassell@mail.cor.epa.gov>
    Re: Y2K.  localtime(time) (J. Moreno)
    Re: Y2K.  localtime(time) (Martien Verbruggen)
        Special: Digest Administrivia (Last modified: 12 Dec 98 (Perl-Users-Digest Admin)

----------------------------------------------------------------------

Date: Fri, 21 May 1999 05:31:21 +0200
From: "Pavel Kotala" <pkotala@logis.cz>
Subject: -w does not work on W32?
Message-Id: <927257616.723830@gate.logis.cz>

What do I wrong? In the script on Windows NT:

while (! -W "x.txt")
{
}
open(X, ">x.txt") or die "Can not open x.txt";

I receive "Can not open x.txt".

Thank you

Pavel Kotala




------------------------------

Date: Thu, 20 May 1999 17:16:03 -0700
From: David Cassell <cassell@mail.cor.epa.gov>
Subject: Re: constants question
Message-Id: <3744A5C3.7514F75A@mail.cor.epa.gov>

John Hilgedick wrote:
> 
> There are a number of places in my code where I'd like to use constants that
> are declared in a separate file (similar to constants that are included in
> header files in the c/c++ world).  How can I do this in perl?  Do I have to
> use a module to do this?  Doesn't perl provide this?  I haven't been able to
> find the answer to this anywhere?  Is there a perl stud out there who can
> help?

I'm hardly a Perl stud.. unless a stud is a half-finished student.
But the answers are right there on your system, in the docs
that came with your Perl install.  To learn about declaring
constants, just type this at your command prompt:

perldoc constant
 
That works because you want the 'constant' pragma, which works
like a module.

To learn how to 'include' another file, you'll want to look
in the perlfunc manpage [type: perldoc perlfunc] [or read the
manpage or the HTML or the POD or...] at 'do' and 'use' and
'require'.

One bit of warning: constant symbols are package scoped (rather 
than block scoped, as use strict is). That is, you can refer to 
a constant from package Other as Other::CONST.  So watch your
packages, or you won't be able to find your 'constants'.

> Any light you can shed would be greatly appreciated!

HTH,
David
-- 
David Cassell, OAO                     cassell@mail.cor.epa.gov
Senior computing specialist
mathematical statistician


------------------------------

Date: Thu, 20 May 1999 20:08:01 -0500
From: "Michael D. Schleif" <mds-resource@mediaone.net>
Subject: Re: FAQ 8.1: How do I find out which operating system I'm running under?
Message-Id: <3744B1F1.5CFC6666@mediaone.net>

But, please, the OS version or release number?

I've struggled with this, off and on, due to running in a very
heterogeneous environment.  Often, I need to decide which system binary
to call, based on *both* OS and version.

Ideas welcome . . .

Tom Christiansen wrote:
> 
> (This excerpt from perlfaq8 - System Interaction
>     ($Revision: 1.37 $, $Date: 1999/04/14 03:46:19 $)
> part of the standard set of documentation included with every
> valid Perl distribution, like the one on your system.
> See also http://language.perl.com/newdocs/pod/perlfaq8.html
> if your negligent system adminstrator has been remiss in his duties.)
> 
>   How do I find out which operating system I'm running under?
> 
>     The $^O variable ($OSNAME if you use English) contains the
>     operating system that your perl binary was built for.
> 
> --
> MAGIC*  xmg_magic;  /* linked list of magicalness */
>     --Larry Wall, from sv.h in the v5.0 perl distribution

-- 

Best Regards,

mds
mds resource
888.250.3987

"Dare to fix things before they break . . . "

"Our capacity for understanding is inversely proportional to how much we
think we know.  The more I know, the more I know I don't know . . . "


------------------------------

Date: Thu, 20 May 1999 17:07:35 -0700
From: RG <roland@oco.net>
Subject: File::Copy
Message-Id: <3744A3C6.4E7FDFCD@oco.net>

I've been away from Perl programming for a little while, and I need to
refresh my knowledge on the modules used. Do I need to install a
file::copy module in the perl files in my perl/bin directory for
file::copy to work properly.

Thanks in advance
Roland
Executive Producer
Radiowave Internet
roland@oco.net



------------------------------

Date: 20 May 1999 22:00:17 -0400
From: Jonathan Feinberg <jdf@pobox.com>
To: ppith@my-dejanews.com
Subject: Re: Forking and sleeping.
Message-Id: <m3d7zvmbbi.fsf@joshua.panix.com>

ppith@my-dejanews.com writes:

> Anyways, I was wondering if Perl could fork off the call to a
> webserver and sleep for ten seconds while waiting for the data.
> When my program wakes up, if the data has still not arrived, I want
> to kill the (child?) process trying to receive the data and move on
> to another webserver.

A *much* simpler solution would be to use LWP::UserAgent with a
timeout.

-- 
Jonathan Feinberg   jdf@pobox.com   Sunny Brooklyn, NY
http://pobox.com/~jdf


------------------------------

Date: Thu, 20 May 1999 20:46:16 -0400
From: "Matthew O. Persico" <mpersico@erols.com>
Subject: How about two arrays? [Was: Blasting array into hash ???]
Message-Id: <3744ACD8.5C71B85E@erols.com>

I have had, on occasion needed to put two arrays into a hash - one array
was keys, the other values. I've used this:

for (@keyArray) {
	$hash{$_} = pop @valueArray;
}

If I couldn't destroy valueArray:

for($i=0;$i<=$#keyArray;$i++) { 
	$hash{$keyArray[$i]} = $valueArray[$i];
}

Seems to me there should be a "slicey" way to to this, but I've been
unable to grok it from perldoc perlfaq4. Anyone willing to point out the
solution I should have figured out by now?

Larry Rosler wrote:
> 
> In article <MPG.11ad0c1d94ab5f81989abf@nntp.hpl.hp.com> on Wed, 19 May
> 1999 18:58:25 -0700, Larry Rosler <lr@hpl.hp.com> says...
> ...
> > General principle to produce a list of $n items:
> >
> >       (EXPR)   x  $n      -- EXPR evaluated once and repeated $n times.
> >
> >       map EXPR => 1 .. $n -- EXPR evaluated $n times.
> 
> For those who like symmetry, we can use instead of a sequence of
> integers a picket fence:
> 
>         map EXPR => (1) x $n
> 
> --
> (Just Another Larry) Rosler
> Hewlett-Packard Company
> http://www.hpl.hp.com/personal/Larry_Rosler/
> lr@hpl.hp.com

-- 
Matthew O. Persico
http://www.erols.com/mpersico
    
You'll have to pry my Emacs from my cold dead oversized
   control-pressing left pinky finger. -- Randal L. Schwartz


------------------------------

Date: Fri, 21 May 1999 00:50:10 GMT
From: mike@mike.stok.co.uk (Mike Stok)
Subject: Re: How about two arrays? [Was: Blasting array into hash ???]
Message-Id: <65213.3577$tP2.399208@typhoon.austin.rr.com>

In article <3744ACD8.5C71B85E@erols.com>,
Matthew O. Persico <mpersico@erols.com> wrote:
>I have had, on occasion needed to put two arrays into a hash - one array
>was keys, the other values. I've used this:

[...]

>Seems to me there should be a "slicey" way to to this, but I've been
>unable to grok it from perldoc perlfaq4. Anyone willing to point out the
>solution I should have figured out by now?

You mean something like:

  @hash{@keyArray} = @valueArray;

?

Hope this helps,

Mike

-- 
mike@stok.co.uk                    |           The "`Stok' disclaimers" apply.
http://www.stok.co.uk/~mike/       |   PGP fingerprint FE 56 4D 7D 42 1A 4A 9C
                                   |                   65 F3 3F 1D 27 22 B7 41
stok@colltech.com                  |            Collective Technologies (work)


------------------------------

Date: 20 May 1999 17:18:59 GMT
From: john@jhorne.csd.plymouth.ac.uk (John Horne)
Subject: Re: Is it a file or a link?
Message-Id: <374435f3@palantir.pbs.plym.ac.uk>

In article <7i19p4$97i$1@owl.slip.net>,
	"Stephen Warren" <swarren@www.wwwdotorg.org> writes:
> John Horne <john@jhorne.csd.plym.ac.uk> wrote in message
> news:37428a99@palantir.pbs.plym.ac.uk...
>> The test 'if ( -f $filename)' will be positive if the file is real
>> or a link. The test 'if (-l $filename)' will tell me if it is a link,
>> and I know I could combined them into
>>   'if (-f $filename && ! -l $filename)'
>> to let me know if it is a real file (i.e. not a link). But is there
>> an easier way? [...rest snipped...]
> 
> If efficiency is your concern, then the perldoc that details either the
> function stat, or -f/-l etc should mention the implicit file _ (IIRC) that
> effectively stores the result of the last stat() (or -f etc IIRC) so you
> might get away with something like:
> 
>     if ( -f $filename && ! -l _ )
> 
I think your syntax is okay. It's not the fact that efficiency is the 
concern but rather the fact that there is no simple/simpler way of
testing a 'real' file. It's more a programming language thing :-)
Thanks for the reply though.

John.
--------------------------------------------------------------------------
John Horne, University of Plymouth, UK             Tel: +44 (0)1752 233914
E-mail: jhorne@plymouth.ac.uk                      ICQ: 36532881
Home page: http://jhorne.csd.plymouth.ac.uk
Finger for PGP key: john@jhorne.csd.plymouth.ac.uk


------------------------------

Date: Thu, 20 May 1999 22:11:14 -0400
From: "Jane H." <memberjh@yahoo.com>
Subject: killing a perl CGI on NT
Message-Id: <7i2fco$4k7@sjx-ixn5.ix.netcom.com>

I am connecting to a database on an NT platform via perl DBI w/ CGI.

Since  perl's "fork" doesn't work on NT, is there  another way to check on
the time elapsed since the script started, and kill it?

For example, if  I hit the submit button from the browser, and the query is
taking more than a certain amount of  time  --- how to stop it?   can I set
a timeout value in the script?

On a similar note,  does anyone know if there are  any current plans to
implement 'fork' on NT?


Thanks in advance.




------------------------------

Date: Thu, 20 May 1999 17:20:38 -0700
From: David Cassell <cassell@mail.cor.epa.gov>
Subject: Re: Merge MS Word documents
Message-Id: <3744A6D6.DB8A1D32@mail.cor.epa.gov>

David Beckley wrote:
> 
> I am trying to merge a bunch of MS Word 97 documents into a single
> document with a Perl program. The program works fine on straight ASCII
> text, but balks when it hits the control codes at the front on the
> WORD documents. Any hints, please?

Yes.  Don't do that.  Word documents have carefully-defined
headers, etc., so that lumping them together in a big 'cat'
can be A Bad Thing.

Instead, use Win32::OLE to manipulate the Word files through
OLE Automation.  You mgiht want to join the win32-perl-users
listserv, which you can do from www.activestate.com .  They
discuss topics like this regularly.
 
> Sorry I don't have the program to show you at the moment....

Ditto.  :-) 

> TIA,

YW, 
David
-- 
David Cassell, OAO                     cassell@mail.cor.epa.gov
Senior computing specialist
mathematical statistician


------------------------------

Date: Fri, 21 May 1999 00:10:47 GMT
From: Corus <corus@my-dejanews.com>
Subject: Perl compiler...If or when
Message-Id: <7i28a6$pue$1@nnrp1.deja.com>

Hi.
Three or four years after its alpha release, the Perl compiler is still
far from complete and it doesn't look like one of the Perl developer
community's more significant projects.

At times I have been given the impression that not only is there not
enough interest in the project (from its developers), but that there are
people that would rather see it shelved.

Are its difficult to decrypt offspring contrary to the principles of
open source software that Perl so strongly advocates, and therefore a
contradiction in terms?
Is it a complex project that is just not going too well solely due to
its complexity?
Or are there not enough people willing to get involved in its
development due to possibly, lack of interest from the users?

Anyone's views on this are appreciated but I, and I'm sure lots of other
people, would be keen to hear the views of the guys and hopefully girls
involved in the development of Perl.
(Did any girls read this? Please send gif with telephone number on the
back.)

regards...


--== Sent via Deja.com http://www.deja.com/ ==--
---Share what you know. Learn what you don't.---


------------------------------

Date: 20 May 1999 19:46:16 -0700
From: merlyn@stonehenge.com (Randal L. Schwartz)
Subject: Re: Perl compiler...If or when
Message-Id: <m1so8r87if.fsf@halfdome.holdit.com>

>>>>> "Corus" == Corus  <corus@my-dejanews.com> writes:

Corus> Three or four years after its alpha release, the Perl compiler
Corus> is still far from complete and it doesn't look like one of the
Corus> Perl developer community's more significant projects.

You need to read the P5P mailing list more. :)

First, let's clear up terms.  Perl already *is* a compiler.  What
you're looking for is the "byte code saver" to make permanent what the
compile phase generates, rather than being always a "just-in-time"
compiler that executes every time you say go.

Corus> At times I have been given the impression that not only is
Corus> there not enough interest in the project (from its developers),
Corus> but that there are people that would rather see it shelved.

Some, yes.  But there is plenty of interest amongst P5P members.
Usually for different reasons than most of the requestors.

Which brings me to a point?  Why do *you* want a "compiler"?
Algorithm hiding is pointless (see below).  Speeding up?  Not
necessarily.  Portable binary distribution?  Not unless you also
install all the modules.  Speed up CGI?  Just use mod_perl.

So, why?

Corus> Are its difficult to decrypt offspring contrary to the
Corus> principles of open source software that Perl so strongly
Corus> advocates, and therefore a contradiction in terms?

For the people that want a "compiler" for all the wrong reasons, yes.
I've heard that any byte-code saver will automatically come with a
decompiler for that very reason.  In fact, B::Deparse does exactly
that.

Corus> Is it a complex project that is just not going too well solely due to
Corus> its complexity?

That's part of it.  Perl has so many overlapping functions to move
stuff between compile-time and run-time that you end up not getting
the wins you want by saving the output of the compiler.

Corus> Or are there not enough people willing to get involved in its
Corus> development due to possibly, lack of interest from the users?

Nope.  Not enough "round tuits" on the development side, more like it.
It takes a very clever person to hack the compiler, and clever people
are highly in demand.  The bang is not yet outweighing the buck.

Now, if a sugar daddy were to come along and buy someone's time for
six months, I'm sure we'd see a lot of progress.  If you'd be willing
to offer, I'll direct you to the right people. :)

-- 
Name: Randal L. Schwartz / Stonehenge Consulting Services (503)777-0095
Keywords: Perl training, UNIX[tm] consulting, video production, skiing, flying
Email: <merlyn@stonehenge.com> Snail: (Call) PGP-Key: (finger merlyn@teleport.com)
Web: <A HREF="http://www.stonehenge.com/merlyn/">My Home Page!</A>
Quote: "I'm telling you, if I could have five lines in my .sig, I would!" -- me


------------------------------

Date: Thu, 20 May 1999 15:49:30 -0400
From: tadmc@metronet.com (Tad McClellan)
Subject: Re: Sorting a Multi-dimensional array by specific element
Message-Id: <a0p1i7.5ae.ln@magna.metronet.com>

David Lindsay (david.lindsay@columbian.com) wrote:
: I've run into a problem trying to sort a multi-dimensional array.

: I want to sort the array by the 2nd element, then the 4th.

: To load the array I use:
: while (defined ($inrec = <INFILE>))
:  {
:  chomp $inrec;
:  push @gl, [ split ' ', $inrec ];
:  }

: I can access the data by referencing $gl[$x]->[$y], so I know the data
: gets loaded.

: If anyone can explain a good way to do this I would appreciate it.


   Borrow the code from the Perl FAQ, part 4:

      "How do I sort an array by (anything)?"


   Modify it for your case:

@sorted = map  { $_->[0] }
          sort { $a->[1] cmp $b->[1]  ||          # 2nd field
                 $a->[2] cmp $b->[2]              # 4th field
               }
          map  { [ $_, $$_[1], $$_[3] ] } @gl;


The last map() makes a anon array with three entries:

   The anon array that is a "sort element".

   The second element of that anon array.

   The fourth element of that anon array.


The sort() first tries to order based on the second element, if
they are equal, then it tries based on the third element.


The first map() gets the anon array back.


--
    Tad McClellan                          SGML Consulting
    tadmc@metronet.com                     Perl programming
    Fort Worth, Texas


------------------------------

Date: Fri, 21 May 1999 02:26:52 GMT
From: ainsoph@propaganda-arts.org
Subject: stripping text with regex
Message-Id: <7i2g9a$vds$1@nnrp1.deja.com>

Is it possible to use regex to stip the text off of a string, say a
first name, and turn it into an initial?

example: chris = c


tia



--== Sent via Deja.com http://www.deja.com/ ==--
---Share what you know. Learn what you don't.---


------------------------------

Date: Thu, 20 May 1999 21:47:16 -0500
From: "Michael D. Schleif" <mds-resource@mediaone.net>
Subject: Re: stripping text with regex
Message-Id: <3744C934.89043F7F@mediaone.net>

yes

ainsoph@propaganda-arts.org wrote:
> 
> Is it possible to use regex to stip the text off of a string, say a
> first name, and turn it into an initial?
> 
> example: chris = c
> 
> tia
> 
> --== Sent via Deja.com http://www.deja.com/ ==--
> ---Share what you know. Learn what you don't.---

-- 

Best Regards,

mds
mds resource
888.250.3987

"Dare to fix things before they break . . . "

"Our capacity for understanding is inversely proportional to how much we
think we know.  The more I know, the more I know I don't know . . . "


------------------------------

Date: Thu, 20 May 1999 22:55:32 -0400
From: "Jane H." <memberjh@yahoo.com>
Subject: Re: stripping text with regex
Message-Id: <7i2hvr$d0t@dfw-ixnews8.ix.netcom.com>

$text=substr($text,0,1);


ainsoph@propaganda-arts.org wrote in message
<7i2g9a$vds$1@nnrp1.deja.com>...
>Is it possible to use regex to stip the text off of a string, say a
>first name, and turn it into an initial?
>
>example: chris = c
>
>
>tia
>
>
>
>--== Sent via Deja.com http://www.deja.com/ ==--
>---Share what you know. Learn what you don't.---




------------------------------

Date: Thu, 20 May 1999 23:36:09 -0400
From: "Jody Fedor" <JFedor@datacom-css.com>
Subject: Re: stripping text with regex
Message-Id: <7i2ing$dku$1@plonk.apk.net>


Don't you just love the smug answers you get here?






------------------------------

Date: Thu, 20 May 1999 17:05:20 -0700
From: David Cassell <cassell@mail.cor.epa.gov>
To: Wassim Metallaoui <wassimk@iname.com>
Subject: Re: Win32 Build Vs. Unix Build!!!
Message-Id: <3744A340.618001F@mail.cor.epa.gov>

Wassim Metallaoui wrote:
> 
> Perl Newsgroup Readers,
> 
> Is the Win32 build of Perl the same as the normal Unix build... If not what
> is left out...

There's a whole section or two in the ActivePerl FAQ, which comes
in HTML format with the ActiveState Perl install.  If that's
what you're using, then you should have access to it via your
Start menu.  alarm() and fork() are the two most frequently
used functions which cause modules to break when you were hoping
to port them to your win32 box.
 
> I was told that flock would not work on a windows machine....

It depends on what you have.

Well, that was helpful, wasn't it?  flock() works quite nicely
on WinNT.  It doesn't seem to work on win95.  I don't think
it works on win98 either.  That's ActiveState Perl.  If you
build your own Perl using Cygwin32 or Mingw32 (these are
free development environments), you can get around this.

> I am asking because I am using [Webster Professional]

Don't know about it.  Is it a unix-based Perl program?
Do you want to call it from Perl after locking a file first?
There are other ways to simulate file-locking, but they
are usually not atomic, and have risks of failure (read
file corruption).

> Please e-mail or CC this reply to wassimk@iname.com if possible..

Done.
 
David
-- 
David Cassell, OAO                     cassell@mail.cor.epa.gov
Senior computing specialist
mathematical statistician


------------------------------

Date: Thu, 20 May 1999 21:24:51 -0400
From: planb@newsreaders.com (J. Moreno)
Subject: Re: Y2K.  localtime(time)
Message-Id: <1ds4950.25oxtmfmml17N@roxboro0-0001.dyn.interpath.net>

Eric Bohlman <ebohlman@netcom.com> wrote:

> I'd really like to know *why* so many people have a mental block about
> this.  The description in localtime()'s documentation leaves not the 
> slightest room for interpretation, but for a lot of people it goes in one
> eye and out the other.  It's like trying to get people to spell my last
> name right; if I dictate it to them letter by letter, about half the 
> people will suddenly lose their ability to write down the letter "m";
> it's as if they have some sort of mental rule about "no more than two
> consonants in a row."

Because it fits their preconceptions.  One of the things that people are
great at is making patterns, even where one doesn't exist.  So when they
are doing "Y2K testing" and a year value returns 100, bing-bang-boom
"YEAR 2K BUG" alarm bells start going off and the brain shuts down.

Now as to the rest of your point about his not being competent to do Y2K
testing -- I agree.  Because in a competent tester that alarm would be
ringing: "POSSIBLE YEAR 2K BUG, LOOK AT THE DOCUMENTATION CAREFULLY",
and the brain should turn ON.

-- 
John Moreno


------------------------------

Date: Fri, 21 May 1999 01:59:09 GMT
From: mgjv@comdyn.com.au (Martien Verbruggen)
Subject: Re: Y2K.  localtime(time)
Message-Id: <N5313.103$AX5.1297@nswpull.telstra.net>

In article <7hfqbg$fk_001@its.csiro.au>,
	hans.xie@its.CSIRO.AU (Hans Xie) writes:

> It prints 100, instead of 2000 or 00.
> 
> Any idea?  Thanks in advance.

This will very likely be fixed in a newer release of perl, since it
seems to be difficult to understand for people. Of course, the
documentation, which actually states that this is what will happen,
will also be changed. Because the perl developers don't really want to
do much work, the changes will actually happen to the definition of
the tm struct in C. That should take care of everything. These changes
can be implemented before 2038.

Martien

PS. Don't believe me. But do believe the documentation.

# perldoc -f localtime

-- 
Martien Verbruggen                  | 
Interactive Media Division          | 
Commercial Dynamics Pty. Ltd.       | Curiouser and curiouser, said Alice.
NSW, Australia                      | 


------------------------------

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
comp.lang.perl.moderated. Answer: nothing. 

]From: Russ Allbery <rra@stanford.edu>
]Date: 21 Sep 1998 19:53:43 -0700
]Subject: comp.lang.perl.moderated available via e-mail
]
]It is possible to subscribe to comp.lang.perl.moderated as a mailing list.
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------------------------------
End of Perl-Users Digest V8 Issue 5738
**************************************

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