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  • How to speed up WPF programs?

    - by Sam
    I love programming with and for Windows Presentation Framework. Mostly I write browser-like apps using WPF and XAML. But what really annoys me is the slowness of WPF. A simple page with only a few controls loads fast enough, but as soon as a page is a teeny weeny bit more complex, like containing a lot of data entry fields, one or two tab controls, and stuff, it gets painful. Loading of such a page can take more than one second. Seconds, indeed, especially on not so fast computers (read: the customers computers) it can take ages. Same with changing values on the page. Everything about the WPF UI is somehow sluggy. This is so mean! They give me this beautiful framework, but make it so excruciatingly slow so I'll have to apologize to our customers all the time! My Question: How do you speed up WPF? How do you profile bottlenecks? How do you deal with the slowness? Since this seems to be an universal problem with WPF, I'm looking for general advice, useful for many situations and problems. Some other related questions: What tools do you use for WPF development Tools to develop WPF or Silverlight applications

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  • How do I resolve not fully installed package (python3-setuptools)?

    - by user3737693
    I was trying to install python3-setuptools, and when i run $ sudo apt-get install python3-setuptools I get this error: Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 0 to remove and 6 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Setting up python3-setuptools (0.6.34-0ubuntu1) ... Traceback (most recent call last): File "/usr/bin/py3compile", line 36, in <module> from debpython import files as dpf File "/usr/share/python3/debpython/files.py", line 25, in <module> from debpython.pydist import PUBLIC_DIR_RE File "/usr/share/python3/debpython/pydist.py", line 28, in <module> from debpython.tools import memoize File "/usr/share/python3/debpython/tools.py", line 25, in <module> from datetime import datetime ImportError: /usr/bin/datetime.so: undefined symbol: _Py_ZeroStruct dpkg: error processing python3-setuptools (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: python3-setuptools E: Sub-process /usr/bin/dpkg returned an error code (1) I tried apt-get clean, apt-get autoclean, apt-get remove python3-setuptools, dpkg --remove python3-setuptools, apt-get install -f, dpkg -P --force-remove-reinstreq, dpkg -P --force-all --force-remove-reinstreq and dpkg --purge, but none of them worked. Output of sudo dpkg -P --force-all --force-remove-reinstreq python3-setuptools (Reading database ... 225309 files and directories currently installed.) Removing python3-setuptools ... Traceback (most recent call last): File "/usr/bin/py3clean", line 32, in <module> from debpython import files as dpf File "/usr/share/python3/debpython/files.py", line 25, in <module> from debpython.pydist import PUBLIC_DIR_RE File "/usr/share/python3/debpython/pydist.py", line 28, in <module> from debpython.tools import memoize File "/usr/share/python3/debpython/tools.py", line 25, in <module> from datetime import datetime ImportError: /usr/bin/datetime.so: undefined symbol: _Py_ZeroStruct dpkg: error processing python3-setuptools (--purge): subprocess installed pre-removal script returned error exit status 1 Traceback (most recent call last): File "/usr/bin/py3compile", line 36, in <module> from debpython import files as dpf File "/usr/share/python3/debpython/files.py", line 25, in <module> from debpython.pydist import PUBLIC_DIR_RE File "/usr/share/python3/debpython/pydist.py", line 28, in <module> from debpython.tools import memoize File "/usr/share/python3/debpython/tools.py", line 25, in <module> from datetime import datetime ImportError: /usr/bin/datetime.so: undefined symbol: _Py_ZeroStruct dpkg: error while cleaning up: subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: python3-setuptools

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  • Are there any B-tree programs or sites that show visually how a B-tree works

    - by Phenom
    I found this website that lets you insert and delete items from a B-tree and shows you visually what the B-tree looks like: java b-tree I'm looking for another website or program similar to this. This site does not allow you to specify a B-tree of order 4 (4 pointers and 3 elements), it only lets you specify B-trees with an even number of elements. Also, if possible, I'd like to be able to insert letters instead of numbers. I think I actually found a different site but that was a while ago and can't find it anymore.

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  • Latent Dirichlet Allocation, pitfalls, tips and programs

    - by Gregg Lind
    I'm experimenting with Latent Dirichlet Allocation for topic disambiguation and assignment, and I'm looking for advice. Which program is the "best", where best is some combination of easiest to use, best prior estimation, fast How do I incorporate my intuitions about topicality. Let's say I think I know that some items in the corpus are really in the same category, like all articles by the same author. Can I add that into the analysis? Any unexpected pitfalls or tips I should know before embarking? I'd prefer is there are R or Python front ends for whatever program, but I expect (and accept) that I'll be dealing with C.

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  • Newly installed Ruby gems not showing up in $LOAD_PATH

    - by randombits
    I'm using MacPorts in order to manage my Ruby/Rails/Gems installations. Recently after doing a gem install wirble, wirble fails to load when I start an instance of irb. Here's the output: $ irb --simple-prompt Couldn't load Wirble: no such file to load -- wirble The Wirble gem doesn't show up in my $LOAD_PATH: >> puts $: /opt/local/lib/ruby1.9/gems/1.9.1/gems/actionmailer-2.3.5/lib /opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib /opt/local/lib/ruby1.9/gems/1.9.1/gems/activerecord-2.3.5/lib /opt/local/lib/ruby1.9/gems/1.9.1/gems/activeresource-2.3.5/lib /opt/local/lib/ruby1.9/gems/1.9.1/gems/activesupport-2.3.5/lib /opt/local/lib/ruby1.9/gems/1.9.1/gems/mysql-2.8.1/lib /opt/local/lib/ruby1.9/gems/1.9.1/gems/mysql-2.8.1/ext /opt/local/lib/ruby1.9/gems/1.9.1/gems/mysql-2.8.1/bin /opt/local/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.1/bin /opt/local/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.1/lib /opt/local/lib/ruby1.9/gems/1.9.1/gems/rails-2.3.5/bin /opt/local/lib/ruby1.9/gems/1.9.1/gems/rails-2.3.5/lib /opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.8.7/bin /opt/local/lib/ruby1.9/gems/1.9.1/gems/rake-0.8.7/lib /opt/local/lib/ruby1.9/gems/1.9.1/gems/rubygems-update-1.3.7/hide_lib_for_update /opt/local/lib/ruby1.9/gems/1.9.1/gems/rubygems-update-1.3.7/bin /opt/local/lib/ruby1.9/site_ruby/1.9.1 /opt/local/lib/ruby1.9/site_ruby/1.9.1/i386-darwin10 /opt/local/lib/ruby1.9/site_ruby /opt/local/lib/ruby1.9/vendor_ruby/1.9.1 /opt/local/lib/ruby1.9/vendor_ruby/1.9.1/i386-darwin10 /opt/local/lib/ruby1.9/vendor_ruby /opt/local/lib/ruby1.9/1.9.1 /opt/local/lib/ruby1.9/1.9.1/i386-darwin10 . => nil >> The gem is definitely installed: $ gem list |grep -i wirble wirble (0.1.3) It is located in /opt/local/lib/ruby/gems/1.9.1/gems/wirble-0.1.3/ How do I get this and future gems I installed appended to my $LOAD_PATH?

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  • How to setup prawn on heroku when installed as a git submodule

    - by brad
    I have a rails app that I am trying to deploy to heroku. This app generates pdfs using prawn. I installed prawn as a git submodule rather than as a gem as this is what is recommended on the prawn website (here). This has not worked well with heroku so far though. As stated on heroku's application constraints page submodules are not supported so I followed their instructions to track the submodule in the main project and tried again. This has not worked and when I access my application I get the following error: App failed to start An error happened during the initialization of your app. This may be due to a typo, wrong number of arguments, or calling a function that doesn’t exists. Check the stack trace below for specific details. Make sure the app is working locally in production mode, by running it with RAILS_ENV (for Rails apps) or RACK_ENV (for Sinatra or other rack apps) set to production. e.g. RAILS_ENV=production script/server. Original Error /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': /disk1/home/slugs/208590_03c9c22_67f5/mnt/app/controllers/invoices_controller.rb:37: syntax error, unexpected ')' (SyntaxError) ).to_pdf(@invoice) (and then a whole lot more that I'll spare you from) The .to_pdf function described in the last line is called in a controller in exactly the way described in the prawn how-to that I linked to above so my interpretation of the error message is that prawn is not being installed/detected. Does anyone know how I can address this? I'm new to heroku so have little idea how to approach this. Is the submodule approach for prawn dead in the water from the get-go? Do I need to install it as a gem instead. I'd rather keep it as a submodule just because that works for now and I don't want to break it.

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  • Programs won't write to a file, and I do not know if it is reading it

    - by user320950
    This program is supposed to read files and write them. I took the file open checks out because they kept causing errors. The problem is that the files open like they are supposed to and the names are correct but nothing is on any of the text screens. Do you know what is wrong? #include<iostream> #include<fstream> #include<cstdlib> #include<iomanip> using namespace std; int main() { ifstream in_stream; // reads itemlist.txt ofstream out_stream1; // writes in items.txt ifstream in_stream2; // reads pricelist.txt ofstream out_stream3;// writes in plist.txt ifstream in_stream4;// read recipt.txt ofstream out_stream5;// write display.txt float price=' ',curr_total=0.0; int itemnum=' ', wrong=0; char next; in_stream.open("ITEMLIST.txt", ios::in); // list of avaliable items out_stream1.open("listWititems.txt", ios::out); // list of avaliable items in_stream2.open("PRICELIST.txt", ios::in); out_stream3.open("listWitdollars.txt", ios::out); in_stream4.open("display.txt", ios::in); out_stream5.open("showitems.txt", ios::out); in_stream.close(); // closing files. out_stream1.close(); in_stream2.close(); out_stream3.close(); in_stream4.close(); out_stream5.close(); system("pause"); in_stream.setf(ios::fixed); while(in_stream.eof()) { in_stream >> itemnum; cin.clear(); cin >> next; } out_stream1.setf(ios::fixed); while (out_stream1.eof()) { out_stream1 << itemnum; cin.clear(); cin >> next; } in_stream2.setf(ios::fixed); in_stream2.setf(ios::showpoint); in_stream2.precision(2); while((price== (price*1.00)) && (itemnum == (itemnum*1))) { while (in_stream2 >> itemnum >> price) // gets itemnum and price { while (in_stream2.eof()) // reads file to end of file { in_stream2 >> itemnum; in_stream2 >> price; price++; curr_total= price++; in_stream2 >> curr_total; cin.clear(); // allows more reading cin >> next; } } } out_stream3.setf(ios::fixed); out_stream3.setf(ios::showpoint); out_stream3.precision(2); while((price== (price*1.00)) && (itemnum == (itemnum*1))) { while (out_stream3 << itemnum << price) { while (out_stream3.eof()) // reads file to end of file { out_stream3 << itemnum; out_stream3 << price; price++; curr_total= price++; out_stream3 << curr_total; cin.clear(); // allows more reading cin >> next; } return itemnum, price; } } in_stream4.setf(ios::fixed); in_stream4.setf(ios::showpoint); in_stream4.precision(2); while ( in_stream4.eof()) { in_stream4 >> itemnum >> price >> curr_total; cin.clear(); cin >> next; } out_stream5.setf(ios::fixed); out_stream5.setf(ios::showpoint); out_stream5.precision(2); out_stream5 <<setw(5)<< " itemnum " <<setw(5)<<" price "<<setw(5)<<" curr_total " <<endl; // sends items and prices to receipt.txt out_stream5 << setw(5) << itemnum << setw(5) <<price << setw(5)<< curr_total; // sends items and prices to receipt.txt out_stream5 << " You have a total of " << wrong++ << " errors " << endl; }

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  • Compiling Visual c++ programs from the command line and msvcr90.dll

    - by Stanley kelly
    Hi, When I compile my Visual c++ 2008 express program from inside the IDE and redistribute it on another computer, It starts up fine without any dll dependencies that I haven't accounted for. When I compile the same program from the visual c++ 2008 command line under the start menu and redistribute it to the other computer, it looks for msvcr90.dll at start-up. Here is how it is compiled from the command line cl /Fomain.obj /c main.cpp /nologo -O2 -DNDEBUG /MD /ID:(list of include directories) link /nologo /SUBSYSTEM:WINDOWS /ENTRY:mainCRTStartup /OUT:Build\myprogram.ex e /LIBPATH:D:\libs (list of libraries) and here is how the IDE builds it based on the relevant parts of the build log. /O2 /Oi /GL /I clude" /I (list of includes) /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_UNICODE" /D "UNICODE" /FD /EHsc /MD /Gy /Yu"stdafx.h" /Fp"Release\myprogram" /Fo"Release\\" /Fd"Release\vc90.pdb" /W3 /c /Zi /TP /wd4250 /vd2 Creating command line "cl.exe @d:\myprogram\Release\RSP00000118003188.rsp /nologo /errorReport:prompt" /OUT:"D:\myprgram\Release\myprgram.exe" /INCREMENTAL:NO /LIBPATH:"d:\gtkmm\lib" /MANIFEST /MANIFESTFILE:"Release\myprogam.exe.intermediate.manifest" /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /DEBUG /PDB:"d:\myprogram\Release\myprogram.pdb" /SUBSYSTEM:WINDOWS /OPT:REF /OPT:ICF /LTCG /ENTRY:"mainCRTStartup" /DYNAMICBASE /NXCOMPAT /MACHINE:X86 (list of libraries) Creating command line "link.exe @d:\myprogram\Release\RSP00000218003188.rsp /NOLOGO /ERRORREPORT:PROMPT" /outputresource:"..\Release\myprogram.exe;#1" /manifest .\Release\myprogram.exe.intermediate.manifest Creating command line "mt.exe @d:\myprogram\Release\RSP00000318003188.rsp /nologo" I would like to be able to compile it from the command line and not have it look for such a late version of the runtime dll, like the version compiled from the IDE seems not to do. Both versions pass /MD to the compiler, so i am not sure what to do.

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  • How to check the information of current installed video drivers on Ubuntu?

    - by smwikipedia
    Hi guys, I have just installed Ubuntu 10.04. My CPU usage is high when I do trivial things such as scrolling through a PDF file. So I think my video driver is not properly installed. I want to confirm that by checking the information of my currently installed video driver, such as if there's a driver installed and what version it is. Then I could decide whether to install a new one if it is not up to date. On Windows, I could use the device manager, how to do that on Ubuntu Linux? I don't expect a GUI solution for this. Command line will be just good enough. Many thanks.

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  • What Simple Changes Made the Biggest Improvements to Your Delphi Programs

    - by lkessler
    I have a Delphi 2009 program that handles a lot of data and needs to be as fast as possible and not use too much memory. What small simple changes have you made to your Delphi code that had the biggest impact on the performance of you program by noticeably reducing execution time or memory use? Thanks everyone for all your answers. Many great tips. For completeness, I'll post a few important articles on Delphi optimization that I found. Before you start optimizing Delphi code at About.com Speed and Size: Top 10 Tricks also at About.com Code Optimization Fundamentals and Delphi Optimization Guidelines at High Performance Delphi, relating to Delphi 7 but still very pertinent.

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  • Assembly installed into the GAC not showing up in Visual Studio

    - by yodaj007
    This sounds related to this question, but they aren't the same thing. That question had no assemblies showing up. Mine has everything except the specific one I installed. I'm hoping someone has a solution to this... am I doing something wrong? Or did I find some bug in VS? I am using Visual Studio 2010 Professional Beta 2 on Windows 7 Ultimate. I just downloaded Rhino Mocks and decided to install it into the GAC using the command-line utility GACUTIL. I then rebooted. Here you can see the assembly in my GAC (click to enlarge): And here is the list of assemblies available to me in Visual Studio: Here is the command prompt where I installed it, and then confirmed it: C:\Users\jason\Downloads>gacutil -i Rhino.Mocks.dll Microsoft (R) .NET Global Assembly Cache Utility. Version 4.0.21006.1 Copyright (c) Microsoft Corporation. All rights reserved. Assembly successfully added to the cache C:\Users\jason\Downloads>gacutil /l |grep -i rhino Rhino.Mocks, Version=3.6.0.0, Culture=neutral, PublicKeyToken=0b3305902db7183f, processorArchitecture=MSIL

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  • Robustly killing Windows programs stuck reporting 'problems'

    - by grrussel
    I am looking for a means to kill a Windows exe program that, when being tested from a python script, crashes and presents a dialog to the user; as this program is invoked many times, and may crash repeatedly, this is not suitable. The problem dialog is the standard reporting of a Windows error: "Foo.exe has encountered a problem and needs to close. We are sorry for the inconvenience" and offers a Debug, Send Error Report, and Don't Send buttons. I am able to kill other forms of dialog resulting from crashes (e.g. a Debug build's assert failure dialog is OK.) I have tried taskkill.exe, pskill, and the terminate() function on the Popen object from the subprocess module that was used to invoke the .exe Has anyone encountered this specific issue, and found a resolution? I expect automating user input to select the window, and press the "Don't Send" button is one possible solution, but I would like something far simpler if possible

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  • Windows Server 2008 R2 &ndash; MOSS 2007 &ndash; Internet Information Services is not installed

    - by Manesh Karunakaran
    If you get the following error, while running the SharePoint Products and Technologies Configuration Wizard: Internet Information Services is not installed. You must have Internet Information Services installed in order to use the SharePoint Products and Technologies Configuration Wizard     In order to resolve this, Open Server Manager, go to Roles and right click on Web Server   And in the Window that comes up, Enable the option that says IIS 6 Metabase Compatibility (Installed)

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  • How can you debug Lego Mindstorms programs?

    - by chris
    Is there any way to add any sort of debugging to a Lego Mindstorms program, when using the NXT drag-and-drop environment? It would be nice to be able to monitor the status of the various sensors, but even knowing what step in the program was running would be nice.

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  • My Thread Programs Block

    - by user315378
    I wrote a program that worked as a server. Knowing that "accept" was blocking the program. I wanted to launch a thread with this statement to prevent precisely that the program crashes, but this still happens. Can anybody help? Post code Thanks -(IBAction)Connetti{ if(switchConnessione.on){ int port = [fieldPort.text intValue]; labelStatus.text = [[NSString alloc] initWithFormat:@"Il Server è attivo"]; server_len = sizeof(server); server.sin_family = AF_INET; server.sin_port = htons((u_short)port); server.sin_addr.s_addr = INADDR_ANY; sd = socket (AF_INET, SOCK_STREAM, 0); bind(sd, (struct sockaddr*)&server, sizeof(server)); listen(sd, 1); [NSThread detachNewThreadSelector:@selector(startThreadAccept) toTarget:self withObject:nil]; } else { labelStatus.text = [[NSString alloc] initWithFormat:@"Server non attivo"]; switchChat.on = FALSE; switchChat.enabled = FALSE; } } -(void)startThreadAccept{ NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init]; [self performSelectorOnMainThread:@selector(acceptConnection) withObject:nil waitUntilDone:NO]; [pool release]; } -(void)acceptConnection{ new_sd = accept(sd, (struct sockaddr*)&server, &server_len); labelStatus.text = [[NSString alloc] initWithFormat:@"Ho accettato una connessione:%d", new_sd]; switchChat.enabled = TRUE; }

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  • Can I have a .desktop Launcher for both Python2 and Python3 depending on version installed?

    - by Takkat
    After very few issues only I moved my application from Python2 to Python3 making sure it will still run with Python 2.7, and hence has python = 2.7 as dependency only. This was mainly done because Python3, and some dependencies are not installed in a default 12.04 LTS, and I do not want my users to have to install all Python3 only to run my script. When I create an appname.desktop launcher I now need to decide if it starts my application using Python2, or Python3 like EXEC=python /path/app.py EXEC=python3 /path/app.py But what I would like it to do is to Launch the application with the Python3 interpreter if Python3 is installed. Otherwise use Python2 if Python3 is not installed. How can this be done? Do I need to tell it in my package installation script, or can I have a launcher which can handle both (in case people install Python3 after they had installed my script)?

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  • Java programs using NIO framework

    - by peng
    Hello, everyone I am doing some research related to Java NIO. I need to find some representative applications that are based on this framework. Please feel free to suggest! The more, the merrier! Thanks

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  • Tips for optimizing C#/.NET programs

    - by Bob
    It seems like optimization is a lost art these days. Wasn't there a time when all programmers squeezed every ounce of efficiency from their code? Often doing so while walking 5 miles in the snow? In the spirit of bringing back a lost art, what are some tips that you know of for simple (or perhaps complex) changes to optimize C#/.NET code? Since it's such a broad thing that depends on what one is trying to accomplish it'd help to provide context with your tip. For instance: When concatenating many strings together use StringBuilder instead. If you're only concatenating a handful of strings it's ok to use the + operator. Use string.Compare to compare 2 strings instead of doing something like string1.ToLower() == string2.ToLower()

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  • "ImportError: cannot import name Exchange" when using Celery w/ Kombu installed

    - by alukach
    I'm trying to create a Celery worker node on an Amazon EC2 Windows2008 R2 instance. Due to a plugin we require for another Python module, we are required to user Python3. I've installed Python3.2 and necessary modules and run Celery, but for some reason it states that it can't import Exchange and Queue from Kombu, despite the face that Kombu is installed and can be imported by python. Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:\Users\Administrator>celery Traceback (most recent call last): File "C:\Python32\Scripts\celery-script.py", line 9, in <module> load_entry_point('celery==3.0.11', 'console_scripts', 'celery')() File "C:\Python32\lib\site-packages\celery\__main__.py", line 13, in main from celery.bin.celery import main File "C:\Python32\lib\site-packages\celery\bin\celery.py", line 21, in <module> from celery.utils import term File "C:\Python32\lib\site-packages\celery\utils\__init__.py", line 22, in <module> from kombu import Exchange, Queue ImportError: cannot import name Exchange C:\Users\Administrator>python Python 3.2 (r32:88445, Feb 20 2011, 21:29:02) [MSC v.1500 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> from kombu import Exchange, Queue >>> print('WTF?!?') WTF?!? >>> This problem seems similar to this and this, but I have not been able to remedy the issue. Any ideas?

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