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• Deleted the .AppleDouble files inside my Time Machine backups - are they still OK?

  - by Jon M

  My Ubuntu server is set up to emulate a TimeCapsule (after a very long weekend following the instructions here, here and here). My macbook pro has been backing up happily to it for a month or so now, and all seems well. The other day I was tidying up the extraneous files from my music collection on the server, got a bit loose with the find command... and ended up deleting all the .AppleDouble files underneath '/', which included the Time Machine folder. Now, Time Machine still appears to work fine, it backs up regularly, I can look through all the previous versions of my files, and they seem to restore without trouble. My question is: by deleting the .AppleDouble files, have I actually broken anything? Is the TM data still good, or should I trash it and start fresh (i.e. with a new 'day 0' full backup)?

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• How can I effectively block torrenting?

  - by Chauncellor

  My WNR1000v3 is serving six people and two of them have decided that despite my warnings they're going to torrent heavily all day. Not dealing with that crap I decided to reserve their IPs and set up port blocking 1000-65535 at all times of the day. However.... looking at the log reveals that stuff is still going through. Half of the entries are saying: [LAN access from remote] from <externalIP>:16001 to 192.168.1.7:18946 Friday, Oct 12,2012 22:47:05 and half are saying: [Service blocked: BlockTorrents] from source 192.168.1.7, Friday, Oct 12,2012 22:46:26 Is this because of uPNP? Or does the 'block services' feature Netgear has only work with outgoing connections? Is there something that I'm missing? If it is indeed uPNP, how could I effectively block their torrenting without hurting everyone's use of services like Skype, Playstation Network, etc.?

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• Ubuntu 12.10 Clock is wrong

  - by mardavi

  I have an issue with Ubuntu Quantal, as it shows the wrong time. It is completely messy, the right time from time.is now is 09.43 and my clock shows 17.48. I am using ntp service and I already checked the timezone and it is correct. I also checked the hardware clock through sudo hwclock --showsudo dpkg-reconfigure tzdata and this is right too. I also tried sudo dpkg-reconfigure tzdata but with bad luck. What else can I try? As asked, here my /etc/ntp.conf # /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help driftfile /var/lib/ntp/ntp.drift # Enable this if you want statistics to be logged. #statsdir /var/log/ntpstats/ statistics loopstats peerstats clockstats filegen loopstats file loopstats type day enable filegen peerstats file peerstats type day enable filegen clockstats file clockstats type day enable # Specify one or more NTP servers. # Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board # on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for # more information. server 0.ubuntu.pool.ntp.org server 1.ubuntu.pool.ntp.org server 2.ubuntu.pool.ntp.org server 3.ubuntu.pool.ntp.org server time.nist.gov # Use Ubuntu's ntp server as a fallback. server ntp.ubuntu.com # Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for # details. The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions> # might also be helpful. # # Note that "restrict" applies to both servers and clients, so a configuration # that might be intended to block requests from certain clients could also end # up blocking replies from your own upstream servers. # By default, exchange time with everybody, but don't allow configuration. restrict -4 default kod notrap nomodify nopeer noquery restrict -6 default kod notrap nomodify nopeer noquery # Local users may interrogate the ntp server more closely. restrict 127.0.0.1 restrict ::1 # Clients from this (example!) subnet have unlimited access, but only if # cryptographically authenticated. #restrict 192.168.123.0 mask 255.255.255.0 notrust # If you want to provide time to your local subnet, change the next line. # (Again, the address is an example only.) #broadcast 192.168.123.255 # If you want to listen to time broadcasts on your local subnet, de-comment the # next lines. Please do this only if you trust everybody on the network! #disable auth #broadcastclient In addition, the ntp service was not running when I turned on my laptop today.

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• Server vendor that allows 3rd party disks

  - by Alvin S

  As noted here, Dell is no longer allowing 3rd party disks to be used with their latest servers. As in, they don't work period. Which means that if you buy one of these boxes and want to upgrade the storage later, you have buy disks from Dell at significant premiums. Dell has just given me a very strong reason to take my server business elsewhere. My company buys (instead of leasing) our servers, and typically uses them for 5 years. I need to be able to upgrade/repurpose storage periodically, and do not want to be locked in to whatever Dell might have in stock, at inflated prices to boot. As you will see in the comments of the above link, it seems HP is doing the same thing. I am looking for a server vendor that offers 3-5 year warranty with same day/next day onsite service, and allows me to use 3rd party disks. Suggestions?

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• Network / Internet diagnostic tool to locate an error?

  - by Jesper

  Hi, I’m facing some difficulties with the Internet / network at my work and I have trouble locating the precise error and when and how it occurs. The problem is that the client machines in the house sporadic is disconnected to the Internet. I’m some what new so I haven’t that much inside in the network and apparently neither has my predecessor. What I am requesting and hoping you guys knows about is, if there exist some kind of network monitor tool I can install and run and it will periodically check the network, the Internet connection etc. and record to logs. Then, if there suddenly arises a problem some time of the day in some part of the network or the Internet connection, I can check it perhaps the next day. I’ve just downloaded and installed Microsoft Network Monitor 3.3 application and hopeful it can give me some answers on where the instability is located but I still would like a tool to make different checks and test in some time interval. Do anyone know about such a program or another kind of performance / diagnostic tool / method I can use? Sincere Jesper

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• How can I get a scheduled task to run for a user regardless of which computer the user is logged onto?

  - by Ernst

  I've got a scheduled task that needs to run for a user at a specific time. However, the user sometimes logs onto one machine, the next day onto another, then next week onto yet another. At some pint during the day, the user might have to log onto another machine. How do I get the scheduled task to run regardless of which computer the user is using? I could of course create the task on all computers, but that seems a bit overkill. Running a script on log on (or a group policy) to create the task doesn't seem a good method either. Any ideas? Basically I want the scheduled task to be defined on the user instead of on the computer. If in the end I need to choose between the two options above, which is best?

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• amazon ec2 pricing

  - by Pradyut Bhattacharya

  I m really confused. I was trying to buy hosting at amazon ec2. My site will not be having much of a traffic and i will be installing glassfish and mysql. Usage will be 1gb of ram and around less than 5gb of hardisk and same bandwidth. As mine is a startup, the number of hits per day would be less than 20hits per day, each hit having around 10mins time. How should i calculate the price on the ec2 calculator. Thanks

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• IIS SmtpSVC - Adding remote domains on the fly

  - by Andrej Pintar

  Since I am using SMTPSVC from IIS to send all mail out I have noticed some domains that reject mail regarding LFs and similar SMTP day to day basis problems. So I mostly re route these domains by using smarthosts. Now I aslo read that on IIS7 or most of them when you add a remote domain to domains you must restart SMTPSVC to take effect. I also enabled METABASE editing. So I also hoped that this will help me add remote domains on the fly. But it's not working. Should I use another SMTP: -hmailserver or similar to route DOMAINS by smarthost. We used a smarthost configuration before but ISP smarthost gets a lot on RBL Blacklist so mail comes back. Since DNS MX direct sending is more work because of troublesome domains now I got more work to monitor SMTP logs. Thank you in advance.

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• Does liquid cooling mean I no longer need to dust my machine?

  - by Starkers

  I've got two long haired cats, a dog and I live with a smoker. I use my computer pretty much all day everday, and though I put it to sleep in the night, those fans are constantly going during the day. In just 6 months the rear fans have so much hair wrapped around them it looks more like something from a vacuum cleaner rather than electronic equipment! Due to this, I'm interested in liquid cooling. However, it appears that liquid cooled systems have fans and liquid cooling? Are those just hybrid solutions? They wouldn't really help my situation. There does appear to be fanless systems that use a radiator to dissipate heat. If I implemented one of these could I seal up the vents on my PC and never have to dust it again? Is there a disadvantage to fanless liquid cooling? I don't need to overclock at the moment but I ever want to push my components will fanless liquid cooling be pretty rubbish?

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• monitor network bandwidth via ssh

  - by ServerSideX

  I'm running a Centos 6.4 server with cPanel. WHM (admin side panel) shows about 100GB of bandwidth this month. However, the server's RTG shows 3.4TB last 30 days, 121GB past 24 hours alone. Doesn't make sense. I'm trying to trace the cause of this. It's a shared web hosting server for approximately 300 domains. I would appreciate help tracing this down somehow. I utilize CSF firewall and Configserver exploit scanner as well. Day http://s10.postimg.org/ti1qhj5mx/day.png Week http://s7.postimg.org/8ho8kds57/week.png

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• High Jitter in NTP and poll value never goes above 128

  - by Aseem

  I have a lot of servers syncing to the same NTP servers (4). Not every server is in the same LAN. Some are 3 hops away from the NTP servers and some are 6 hops away. On couple of servers I see that the poll value never touches the 1024 mark and the jitter value is in double digits. Could it be due to the system hardware? These are windows servers (physical) and require as accurate time as possible. Please advice what I should do. Some of the stats that I collected manually from the bad box (which is 6 hops away from the ntp servers) C:\Program Files (x86)\NTP>ntpq -p -n remote refid st t when poll reach delay offset jitter ============================================================================== +*.*.*.25 *.*.*.233 2 u 12 128 377 1.210 -12.579 14.913 +*.*.*.26 *.*.*.233 2 u 96 128 377 1.067 -2.235 9.885 **.*.*.27 *.*.*.233 2 u 24 128 377 1.038 -7.569 11.178 +*.*.*.28 *.*.*.233 2 u 49 128 377 1.288 -11.058 14.544 remote refid st t when poll reach delay offset jitter ============================================================================== +*.*.*.25 *.*.*.233 2 u 124 128 377 0.614 -6.212 5.329 +*.*.*.26 *.*.*.233 2 u 93 128 377 0.910 -9.431 3.111 +*.*.*.27 *.*.*.233 2 u 1 128 377 0.824 -7.428 3.129 **.*.*.28 *.*.*.233 2 u 84 128 377 1.503 -8.230 3.511 remote refid st t when poll reach delay offset jitter ============================================================================== **.*.*.25 *.*.*.233 2 u 117 128 377 1.235 -4.084 11.405 +*.*.*.26 *.*.*.233 2 u 96 128 377 1.335 -11.813 13.130 +*.*.*.27 *.*.*.233 2 u 130 128 377 1.549 -14.036 16.381 -*.*.*.28 *.*.*.233 2 u 79 128 377 1.258 13.395 22.203 remote refid st t when poll reach delay offset jitter ============================================================================== **.*.*.25 *.*.*.233 2 u 88 128 377 1.235 -4.084 14.068 +*.*.*.26 *.*.*.233 2 u 63 128 377 1.335 -11.813 17.086 +*.*.*.27 *.*.*.233 2 u 103 128 377 1.549 -14.036 20.691 -*.*.*.28 *.*.*.233 2 u 47 128 377 1.258 13.395 20.231 remote refid st t when poll reach delay offset jitter ============================================================================== +*.*.*.25 *.*.*.233 2 u 47 64 377 0.652 -15.805 14.077 **.*.*.26 *.*.*.233 2 u 11 64 377 1.013 -14.423 11.375 -*.*.*.27 *.*.*.233 2 u 63 64 377 0.765 -2.030 7.680 +*.*.*.28 *.*.*.233 2 u 4 64 377 1.191 -17.980 14.393 remote refid st t when poll reach delay offset jitter ============================================================================== -*.*.*.25 *.*.*.233 2 u 3 128 377 1.576 18.665 21.999 +*.*.*.26 *.*.*.233 2 u 73 128 377 0.637 -5.012 14.405 **.*.*.27 *.*.*.233 2 u 127 128 377 0.272 -8.237 14.438 +*.*.*.28 *.*.*.233 2 u 123 128 377 1.190 -14.383 18.875 C:\Program Files (x86)\NTP>ntpdc -c loopinfo offset: -0.016430 s frequency: 7.106 ppm poll adjust: 18 watchdog timer: 133 s offset: -0.016430 s frequency: 7.106 ppm poll adjust: 18 watchdog timer: 341 s offset: -0.000149 s frequency: 6.645 ppm poll adjust: 0 watchdog timer: 383 s offset: 0.015735 s frequency: 6.725 ppm poll adjust: 7 watchdog timer: 577 s offset: -0.010331 s frequency: 6.748 ppm poll adjust: 21 watchdog timer: 567 s offset: -0.009427 s frequency: 6.687 ppm poll adjust: 28 watchdog timer: 301 s offset: -0.007361 s frequency: 6.612 ppm poll adjust: 30 watchdog timer: 155 s offset: -0.008106 s frequency: 4.358 ppm poll adjust: 30 watchdog timer: 291 s NTP.conf # NTP configuration file # Use drift file driftfile "C:\Program Files (x86)\NTP\ntp.drift" # Logs statistics loopstats peerstats clockstats statsdir "C:\Program Files (x86)\NTP\logs\" # directory for statistics files filegen peerstats file peerstats type day enable filegen loopstats file loopstats type day enable filegen clockstats file clockstats type day enable logfile "C:\Program Files (x86)\NTP\logs\syslog.txt" # Use specific NTP servers server *.*.*.25 minpoll 4 maxpoll 7 iburst server *.*.*.26 minpoll 4 maxpoll 7 iburst server *.*.*.27 minpoll 4 maxpoll 7 iburst server *.*.*.28 minpoll 4 maxpoll 7 iburst

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• Performance difference between MacBook Pro (2.8 GHz) vs Air (1.7 GHz)?

  - by jonathanconway

  I'm comparing these two Apple laptops: MacBook Pro (13", 2011 model): 2.8GHz dual-core Intel Core i7 processor with 4MB shared L3 cache 4GB (two 2GB SO-DIMMs) of 1333MHz DDR3 SDRAM AMD Radeon HD 6770M graphics processor with 1GB of GDDR5 memory on 2.4GHz configuration MacBook Air (13", 2011 model): 1.7GHz dual-core Intel Core i5 with 3MB shared L3 cache 4GB of 1333MHz DDR3 onboard memory Intel HD Graphics 3000 processor with 384MB of DDR3 SDRAM shared with main memory There's definitely a gap between them in terms of CPU speed and graphics, but what practical difference would this make on a day-to-day basis? On the one hand, I love the sleek, thin appearance of the Air. On the other hand, I don't want a machine that's going to be dog-slow when doing tasks such as running Virtual Machines, dual-booting to Windows and running multiple instances of Visual Studio, and maybe some light gaming. Is there going to be a major difference that makes the MacBook Pro a more attractive purchase?

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• SBS 2003 crashes often due to limited memory

  - by Sanoj

  I have a Windows SBS 2003 Std that regularly crashes, in about every 20th day. The only thing I can see in the logs is that used memory increases with about 30MB/day. The process that uses more and more memory is sqlservr. We don't have much installed on the server; a Point-Of-Sale-system that uses Pervasive SQL as database and an Accounting application. We just have 2GB of RAM and I could upgrade to 4GB but I think that this just delay the problem. Is there any solution to this problem? Could I limit sqlservr to some memory?

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• How many times can data be read from a USB flash drive?

  - by John

  While I am aware that performing writes on a USB flash drive degrades the life expectancy of the device. I have heard the quantity of writes is anywhere from 100 thousand to 10 million, but I have not heard about number of read operations. Does reading from the device count toward this total? I am interested in writing only once to a flash drive and setting it to read-only. Then reading files from the device a thousand or more times per day, but am wondering if (at say 1,000 reads per day), the flash drive will need to be replaced within 100 days (assuming a 100,000 r/w cycle lifetime)?

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• grouping by date in excel and removing time in a pivot table

  - by Ashley DeVan

  My data looks like this: count Added Date 1 8/26/09 3:46 PM 2 8/21/09 6:50 PM 3 8/21/09 3:04 PM 4 8/21/09 3:21 PM 5 5/1/09 6:56 AM 6 5/1/09 8:12 AM 7 5/1/09 8:00 AM 8 5/1/09 8:18 AM 9 5/1/09 8:58 AM 10 5/1/09 8:58 AM 11 5/1/09 9:06 AM 12 5/1/09 9:44 AM 13 5/1/09 9:50 AM 14 5/1/09 11:17 AM 15 5/1/09 11:27 AM 16 5/1/09 11:29 AM 17 5/1/09 11:39 AM 18 5/1/09 12:10 PM 19 5/1/09 12:33 PM When I do a pivot table, I cannot get it to sum by day, it breaks it up by minute. I've even tried parsing the field, but the time always creates an issue. How to I get my pivot table to give me a count by day and ignore the time stamp?

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• What type of VPS stats should I look for?

  - by Dave

  I have a few websites that average a total of 10,000 uniques a day across my network. I also have a few mobile apps that pull xml data maybe 5,000 calls a day. My sites aren't anything major just a few wallpaper websites and few other small sites, nothing real database intensive. I currently own a dedicated server and I feel like it's overkill for my network. I'm looking into getting a Virtual Private Server (VPS). I was just wondering what kind of stats I should be looking for to support my network of sites. Thanks

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• auto copy newest folders and images in MyPictures folder to USB drive

  - by TVersmet

  I drop lots of photos in a day into the My Documents/My Pictures folder. I archive at the end of each day to USB drives, to be stored offsite. What I would like is someway to automate the process. By example, a small app or script I can simply double-click and it will scan the My Pictures folder for the newest folders and images and copy them to the USB drive until the drive is full. It doesn't matter if I get redundancy from the previous days saved images, so long as the newest images and folders are always the first to get copied. Well, that's my request. Thanks for reading.

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• "tar -cfz" versus "tar cf - | gzip": are they different? (or how to improve a backup)

  - by I'm Dario

  I want to speed up my backup done with "tar -cfz", the common way to do it. But day by day my backed up files grow so it becomes slower. I was thinking to take advantage of the several cores available in my server and I was wondering if there is any difference between doing the backup with "tar -cfz" or piping tar to gzip ("tar cf - | gzip"). I guess that there isn't any difference, because the first spawns two processes (tar and gzip), in a similar way like piping it. If there is not difference, do you know any good alternative to do this, without going incremental? I'm looking at pigz too and it looks fine.

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• Why is windows 7 backup and restore utility using so much disc space?

  - by stuckey

  note: this is a reformation of a previous question, see: How exactly does the Backup and Restore utility in Windows7 work? I have per the task scheduler scheduled windows 7 backup and utility to run once a day. The amount of data I produce in a day is best measured in KiB yet, a few GiB of data is added to the backup destination set in the backup utility daily. Why is this? Is this due to this utility making what are called "normal" backups instead of "incremental" backups? If so, how can this setting be changed?

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• Coding exercise for Linux Systems Admin?

  - by Prashanth Sundaram

  Hello All, I am preparing for a Systems Admin(linux) role for a big company(top 10 companies) and one of the requisite is knowledge of a language like perl, python or Ruby. I have a phone interview which involves sharing a editor with the interviewer, now what kind of coding exercise can I expect on a phone interview or a regular interview? I have used shell for most of my day-to-day tasks and occasionally Perl and python for bigger tasks. Now I don't expect them to ask Write a script that sync's AD users to LDAP? I don't think data structures, algorithms or sorting questions apply to me role? Can you give me any examples of SysAdmin related coding questions?

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• ffserver - streaming problem transcodation for input

  - by zozo

  Good day to all. I have a little problem. I'm trying to stream something from a cam to a server and then forward to... somewhere (it will be a site or something). On the computer that I have the cam connected to I use vlc to stream it to the server and there I try to get the stream as an input for a ffserver. The problem is that ffserver doesn't detect the input (regardless of the protocol I use (udp, rtp, etc.)). I suspect a transcoding problem or something like that but I can't find any documentation about that so... Does any1 know what transcodation I should use? Thank you for help and have a great day.

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• Extract data from specific range of cells in multiple worksheet in multiple files.

  - by Michele

  Extract data from specific range of cells(always the same cells) in multiple worksheet in multiple files. 1 file=1 day. I have 6 technicians each day of the week, Monday thru Friday. So, 5 files with 6 worksheets. I have entered specific info in specific cells of every work sheet. The range is constant(the same address in EVERY worksheet in every file.) So, I need a formula to extract and calculate the data in the given range and dump it into another spreadsheet. I can forward an example a file if it will help anyone to answer my question. Or more explanation if necessary is available upon request. JUST PLEASE SOMEBODY HELP ME!!!!! Thank you all in advance. Regards, Michele

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• Running Windows without administrative rights?

  - by overtherainbow

  Hello, Among the millions of applications written for Windows, I assume there are probably quite a lot that are too old or too sloppy to run without administrative rights. To convert users to using non-admin accounts in their day-to-day use of Windows, I need a tool that will sort applications between those than can run safely as non-admin and those that expect to have those rights and will thus show some obvious or not-so-obvious wrong behavior as a result. Does someone know of such a tool that would be available for XP/Vista/7, and either scan the whole disk for unsafe applications, or would be started at boot time and lurk in the background so that it would show a pop-up and report applications that triggered an error because of this lack of admin rights? Thank you.

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• how to rotate one squid user among multiple IPs based on number of requests processed by each IP

  - by Arvind

  I want to set up a Squid ACL in the following manner-- For example, my Squid Proxy Server has 10 IP addresses- now I have a user 'demouser'. I want that for the very first request sent to 'demouser' this user uses IP address #1, for the second request it uses IP address #2, for the 3rd request of the day it uses IP address #3 and so on till it uses up all IPs. One more level of control I would like is that once the user has used up all available IP addresses once per address, then it does not allow the proxy request to go through. How do I set up such a configuration on Squid Proxy server ACL? Even a document or how to would be very helpful. The official wiki talks about one 'weird' case- choosing an IP address based on time of day the request was made to the proxy server. The other cases are all regular use cases which are not even remotely near my requirement as specified above.

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• Can a company use VPN to spy on me?

  - by orokusaki

  I'm about to work with a company on a development project, but they first need to set up a pretty complicated environment, and suggested they use VPN to work on my machine to do this. Should I be concerned that somebody can just watch me work? It would be embarrassing, if somebody could witness my work habits (e.g. Asking questions on SO and researching all day is part of my daily work regiment, and makes me feel like a noob, but it keeps me sharp. I also listen to conspiracy videos all day, and RadioLab podcasts, :). Is VPN going to introduce this possibility, and if so, is there a way around it? EDIT: Also, is there a way I can always tell when somebody is VPNed into my computer?

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