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<title>The Yocto Project Reference Manual</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div lang="en" class="book" title="The Yocto Project Reference Manual">
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<div><h1 class="title">
<a name="poky-ref-manual"></a>
The Yocto Project Reference Manual
</h1></div>
<div><div class="authorgroup">
<div class="author">
<h3 class="author">
<span class="firstname">Richard</span> <span class="surname">Purdie</span>
</h3>
<div class="affiliation">
<span class="orgname">Linux Foundation<br></span>
</div>
<code class="email">&lt;<a class="email" href="mailto:richard.purdie@linuxfoundation.org">richard.purdie@linuxfoundation.org</a>&gt;</code>
</div>
</div></div>
<div><p class="copyright">Copyright <20> 2010-2013 Linux Foundation</p></div>
<div><div class="legalnotice" title="Legal Notice">
<a name="idm3374608"></a>
<p>
Permission is granted to copy, distribute and/or modify this document under
the terms of the <a class="ulink" href="http://creativecommons.org/licenses/by-sa/2.0/uk/" target="_self">Creative Commons Attribution-Share Alike 2.0 UK: England &amp; Wales</a> as published by Creative Commons.
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>
Due to production processes, there could be differences between the Yocto Project
documentation bundled in the release tarball and the
<a class="link" href="../poky-ref-manual/index.html" target="_self">Yocto Project Reference Manual</a> on
the <a class="ulink" href="http://www.yoctoproject.org" target="_self">Yocto Project</a> website.
For the latest version of this manual, see the manual on the website.
</div>
</div></div>
<div><div class="revhistory"><table border="1" width="100%" summary="Revision history">
<tr><th align="left" valign="top" colspan="2"><b>Revision History</b></th></tr>
<tr>
<td align="left">Revision 4.0+git</td>
<td align="left">24 November 2010</td>
</tr>
<tr><td align="left" colspan="2">Released with the Yocto Project 0.9 Release</td></tr>
<tr>
<td align="left">Revision 1.0</td>
<td align="left">6 April 2011</td>
</tr>
<tr><td align="left" colspan="2">Released with the Yocto Project 1.0 Release.</td></tr>
<tr>
<td align="left">Revision 1.0.1</td>
<td align="left">23 May 2011</td>
</tr>
<tr><td align="left" colspan="2">Released with the Yocto Project 1.0.1 Release.</td></tr>
<tr>
<td align="left">Revision 1.1</td>
<td align="left">6 October 2011</td>
</tr>
<tr><td align="left" colspan="2">Released with the Yocto Project 1.1 Release.</td></tr>
<tr>
<td align="left">Revision 1.2</td>
<td align="left">April 2012</td>
</tr>
<tr><td align="left" colspan="2">Released with the Yocto Project 1.2 Release.</td></tr>
<tr>
<td align="left">Revision 1.3</td>
<td align="left">October 2012</td>
</tr>
<tr><td align="left" colspan="2">Released with the Yocto Project 1.3 Release.</td></tr>
<tr>
<td align="left">Revision 1.4</td>
<td align="left">Sometime in 2013</td>
</tr>
<tr><td align="left" colspan="2">Released with the Yocto Project 1.4 Release.</td></tr>
</table></div></div>
</div>
<hr>
</div>
<div class="toc">
<p><b>Table of Contents</b></p>
<dl>
<dt><span class="chapter"><a href="intro.html">1. Introduction</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="intro-welcome.html">1.1. Introduction</a></span></dt>
<dt><span class="section"><a href="intro-manualoverview.html">1.2. Documentation Overview</a></span></dt>
<dt><span class="section"><a href="intro-requirements.html">1.3. System Requirements</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="detailed-supported-distros.html">1.3.1. Supported Linux Distributions</a></span></dt>
<dt><span class="section"><a href="required-packages-for-the-host-development-system.html">1.3.2. Required Packages for the Host Development System</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="intro-getit.html">1.4. Obtaining the Yocto Project</a></span></dt>
<dt><span class="section"><a href="intro-getit-dev.html">1.5. Development Checkouts</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="usingpoky.html">2. Using the Yocto Project</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="usingpoky-build.html">2.1. Running a Build</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="build-overview.html">2.1.1. Build Overview</a></span></dt>
<dt><span class="section"><a href="building-an-image-using-gpl-components.html">2.1.2. Building an Image Using GPL Components</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="usingpoky-install.html">2.2. Installing and Using the Result</a></span></dt>
<dt><span class="section"><a href="usingpoky-debugging.html">2.3. Debugging Build Failures</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="usingpoky-debugging-taskfailures.html">2.3.1. Task Failures</a></span></dt>
<dt><span class="section"><a href="usingpoky-debugging-taskrunning.html">2.3.2. Running Specific Tasks</a></span></dt>
<dt><span class="section"><a href="usingpoky-debugging-dependencies.html">2.3.3. Dependency Graphs</a></span></dt>
<dt><span class="section"><a href="usingpoky-debugging-bitbake.html">2.3.4. General BitBake Problems</a></span></dt>
<dt><span class="section"><a href="usingpoky-debugging-buildfile.html">2.3.5. Building with No Dependencies</a></span></dt>
<dt><span class="section"><a href="usingpoky-debugging-variables.html">2.3.6. Variables</a></span></dt>
<dt><span class="section"><a href="recipe-logging-mechanisms.html">2.3.7. Recipe Logging Mechanisms</a></span></dt>
<dt><span class="section"><a href="usingpoky-debugging-others.html">2.3.8. Other Tips</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="maintaining-build-output-quality.html">2.4. Maintaining Build Output Quality</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="enabling-and-disabling-build-history.html">2.4.1. Enabling and Disabling Build History</a></span></dt>
<dt><span class="section"><a href="understanding-what-the-build-history-contains.html">2.4.2. Understanding What the Build History Contains</a></span></dt>
</dl></dd>
</dl></dd>
<dt><span class="chapter"><a href="technical-details.html">3. Technical Details</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="usingpoky-components.html">3.1. Yocto Project Components</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="usingpoky-components-bitbake.html">3.1.1. BitBake</a></span></dt>
<dt><span class="section"><a href="usingpoky-components-metadata.html">3.1.2. Metadata (Recipes)</a></span></dt>
<dt><span class="section"><a href="usingpoky-components-classes.html">3.1.3. Classes</a></span></dt>
<dt><span class="section"><a href="usingpoky-components-configuration.html">3.1.4. Configuration</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="shared-state-cache.html">3.2. Shared State Cache</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="overall-architecture.html">3.2.1. Overall Architecture</a></span></dt>
<dt><span class="section"><a href="checksums.html">3.2.2. Checksums (Signatures)</a></span></dt>
<dt><span class="section"><a href="shared-state.html">3.2.3. Shared State</a></span></dt>
<dt><span class="section"><a href="tips-and-tricks.html">3.2.4. Tips and Tricks</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="x32.html">3.3. x32</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="support.html">3.3.1. Support</a></span></dt>
<dt><span class="section"><a href="future-development-and-limitations.html">3.3.2. Future Development and Limitations</a></span></dt>
<dt><span class="section"><a href="using-x32-right-now.html">3.3.3. Using x32 Right Now</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="licenses.html">3.4. Licenses</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="usingpoky-configuring-LIC_FILES_CHKSUM.html">3.4.1. Tracking License Changes</a></span></dt>
<dt><span class="section"><a href="enabling-commercially-licensed-recipes.html">3.4.2. Enabling Commercially Licensed Recipes</a></span></dt>
</dl></dd>
</dl></dd>
<dt><span class="chapter"><a href="migration.html">4. Migrating to a Newer Yocto Project Release</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="moving-to-the-yocto-project-1.3-release.html">4.1. Moving to the Yocto Project 1.3 Release</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="1.3-local-configuration.html">4.1.1. Local Configuration</a></span></dt>
<dt><span class="section"><a href="1.3-recipes.html">4.1.2. Recipes</a></span></dt>
</dl></dd>
</dl></dd>
<dt><span class="chapter"><a href="ref-structure.html">5. Source Directory Structure</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="structure-core.html">5.1. Top level core components</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="structure-core-bitbake.html">5.1.1. <code class="filename">bitbake/</code></a></span></dt>
<dt><span class="section"><a href="structure-core-build.html">5.1.2. <code class="filename">build/</code></a></span></dt>
<dt><span class="section"><a href="handbook.html">5.1.3. <code class="filename">documentation</code></a></span></dt>
<dt><span class="section"><a href="structure-core-meta.html">5.1.4. <code class="filename">meta/</code></a></span></dt>
<dt><span class="section"><a href="structure-core-meta-yocto.html">5.1.5. <code class="filename">meta-yocto/</code></a></span></dt>
<dt><span class="section"><a href="structure-core-meta-yocto-bsp.html">5.1.6. <code class="filename">meta-yocto-bsp/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-hob.html">5.1.7. <code class="filename">meta-hob/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-skeleton.html">5.1.8. <code class="filename">meta-skeleton/</code></a></span></dt>
<dt><span class="section"><a href="structure-core-scripts.html">5.1.9. <code class="filename">scripts/</code></a></span></dt>
<dt><span class="section"><a href="structure-core-script.html">5.1.10. <code class="filename">oe-init-build-env</code></a></span></dt>
<dt><span class="section"><a href="structure-basic-top-level.html">5.1.11. <code class="filename">LICENSE, README, and README.hardware</code></a></span></dt>
</dl></dd>
<dt><span class="section"><a href="structure-build.html">5.2. The Build Directory - <code class="filename">build/</code></a></span></dt>
<dd><dl>
<dt><span class="section"><a href="structure-build-pseudodone.html">5.2.1. <code class="filename">build/pseudodone</code></a></span></dt>
<dt><span class="section"><a href="structure-build-conf-local.conf.html">5.2.2. <code class="filename">build/conf/local.conf</code></a></span></dt>
<dt><span class="section"><a href="structure-build-conf-bblayers.conf.html">5.2.3. <code class="filename">build/conf/bblayers.conf</code></a></span></dt>
<dt><span class="section"><a href="structure-build-conf-sanity_info.html">5.2.4. <code class="filename">build/conf/sanity_info</code></a></span></dt>
<dt><span class="section"><a href="structure-build-downloads.html">5.2.5. <code class="filename">build/downloads/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-sstate-cache.html">5.2.6. <code class="filename">build/sstate-cache/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp.html">5.2.7. <code class="filename">build/tmp/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp-buildstats.html">5.2.8. <code class="filename">build/tmp/buildstats/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp-cache.html">5.2.9. <code class="filename">build/tmp/cache/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp-deploy.html">5.2.10. <code class="filename">build/tmp/deploy/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp-deploy-deb.html">5.2.11. <code class="filename">build/tmp/deploy/deb/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp-deploy-rpm.html">5.2.12. <code class="filename">build/tmp/deploy/rpm/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp-deploy-licenses.html">5.2.13. <code class="filename">build/tmp/deploy/licenses/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp-deploy-images.html">5.2.14. <code class="filename">build/tmp/deploy/images/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp-deploy-ipk.html">5.2.15. <code class="filename">build/tmp/deploy/ipk/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp-sysroots.html">5.2.16. <code class="filename">build/tmp/sysroots/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp-stamps.html">5.2.17. <code class="filename">build/tmp/stamps/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp-log.html">5.2.18. <code class="filename">build/tmp/log/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp-pkgdata.html">5.2.19. <code class="filename">build/tmp/pkgdata/</code></a></span></dt>
<dt><span class="section"><a href="structure-build-tmp-work.html">5.2.20. <code class="filename">build/tmp/work/</code></a></span></dt>
</dl></dd>
<dt><span class="section"><a href="structure-meta.html">5.3. The Metadata - <code class="filename">meta/</code></a></span></dt>
<dd><dl>
<dt><span class="section"><a href="structure-meta-classes.html">5.3.1. <code class="filename">meta/classes/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-conf.html">5.3.2. <code class="filename">meta/conf/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-conf-machine.html">5.3.3. <code class="filename">meta/conf/machine/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-conf-distro.html">5.3.4. <code class="filename">meta/conf/distro/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-bsp.html">5.3.5. <code class="filename">meta/recipes-bsp/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-connectivity.html">5.3.6. <code class="filename">meta/recipes-connectivity/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-core.html">5.3.7. <code class="filename">meta/recipes-core/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-devtools.html">5.3.8. <code class="filename">meta/recipes-devtools/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-extended.html">5.3.9. <code class="filename">meta/recipes-extended/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-gnome.html">5.3.10. <code class="filename">meta/recipes-gnome/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-graphics.html">5.3.11. <code class="filename">meta/recipes-graphics/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-kernel.html">5.3.12. <code class="filename">meta/recipes-kernel/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-multimedia.html">5.3.13. <code class="filename">meta/recipes-multimedia/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-qt.html">5.3.14. <code class="filename">meta/recipes-qt/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-rt.html">5.3.15. <code class="filename">meta/recipes-rt/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-sato.html">5.3.16. <code class="filename">meta/recipes-sato/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-support.html">5.3.17. <code class="filename">meta/recipes-support/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-site.html">5.3.18. <code class="filename">meta/site/</code></a></span></dt>
<dt><span class="section"><a href="structure-meta-recipes-txt.html">5.3.19. <code class="filename">meta/recipes.txt</code></a></span></dt>
</dl></dd>
</dl></dd>
<dt><span class="chapter"><a href="ref-bitbake.html">6. BitBake</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="ref-bitbake-parsing.html">6.1. Parsing</a></span></dt>
<dt><span class="section"><a href="ref-bitbake-providers.html">6.2. Preferences and Providers</a></span></dt>
<dt><span class="section"><a href="ref-bitbake-dependencies.html">6.3. Dependencies</a></span></dt>
<dt><span class="section"><a href="ref-bitbake-tasklist.html">6.4. The Task List</a></span></dt>
<dt><span class="section"><a href="ref-bitbake-runtask.html">6.5. Running a Task</a></span></dt>
<dt><span class="section"><a href="ref-bitbake-commandline.html">6.6. BitBake Command Line</a></span></dt>
<dt><span class="section"><a href="ref-bitbake-fetchers.html">6.7. Fetchers</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="ref-classes.html">7. Classes</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="ref-classes-base.html">7.1. The base class - <code class="filename">base.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-autotools.html">7.2. Autotooled Packages - <code class="filename">autotools.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-update-alternatives.html">7.3. Alternatives - <code class="filename">update-alternatives.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-update-rc.d.html">7.4. Initscripts - <code class="filename">update-rc.d.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-binconfig.html">7.5. Binary config scripts - <code class="filename">binconfig.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-debian.html">7.6. Debian renaming - <code class="filename">debian.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-pkgconfig.html">7.7. Pkg-config - <code class="filename">pkgconfig.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-src-distribute.html">7.8. Distribution of sources - <code class="filename">src_distribute_local.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-perl.html">7.9. Perl modules - <code class="filename">cpan.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-distutils.html">7.10. Python extensions - <code class="filename">distutils.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-devshell.html">7.11. Developer Shell - <code class="filename">devshell.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-packagegroup.html">7.12. Package Groups - <code class="filename">packagegroup.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-package.html">7.13. Packaging - <code class="filename">package*.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-kernel.html">7.14. Building kernels - <code class="filename">kernel.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-image.html">7.15. Creating images - <code class="filename">image.bbclass</code> and <code class="filename">rootfs*.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-sanity.html">7.16. Host System sanity checks - <code class="filename">sanity.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-insane.html">7.17. Generated output quality assurance checks - <code class="filename">insane.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-siteinfo.html">7.18. Autotools configuration data cache - <code class="filename">siteinfo.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-useradd.html">7.19. Adding Users - <code class="filename">useradd.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-externalsrc.html">7.20. Using External Source - <code class="filename">externalsrc.bbclass</code></a></span></dt>
<dt><span class="section"><a href="ref-classes-others.html">7.21. Other Classes</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="ref-images.html">8. Images</a></span></dt>
<dt><span class="chapter"><a href="ref-features.html">9. Reference: Features</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="ref-features-distro.html">9.1. Distro</a></span></dt>
<dt><span class="section"><a href="ref-features-machine.html">9.2. Machine</a></span></dt>
<dt><span class="section"><a href="ref-features-image.html">9.3. Images</a></span></dt>
<dt><span class="section"><a href="ref-features-backfill.html">9.4. Feature Backfilling</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="ref-variables-glos.html">10. Variables Glossary</a></span></dt>
<dd><dl><dt><span class="glossary"><a href="ref-variables-glos.html#ref-variables-glossary">Glossary</a></span></dt></dl></dd>
<dt><span class="chapter"><a href="ref-varlocality.html">11. Variable Context</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="ref-varlocality-configuration.html">11.1. Configuration</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="ref-varlocality-config-distro.html">11.1.1. Distribution (Distro)</a></span></dt>
<dt><span class="section"><a href="ref-varlocality-config-machine.html">11.1.2. Machine</a></span></dt>
<dt><span class="section"><a href="ref-varlocality-config-local.html">11.1.3. Local</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="ref-varlocality-recipes.html">11.2. Recipes</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="ref-varlocality-recipe-required.html">11.2.1. Required</a></span></dt>
<dt><span class="section"><a href="ref-varlocality-recipe-dependencies.html">11.2.2. Dependencies</a></span></dt>
<dt><span class="section"><a href="ref-varlocality-recipe-paths.html">11.2.3. Paths</a></span></dt>
<dt><span class="section"><a href="ref-varlocality-recipe-build.html">11.2.4. Extra Build Information</a></span></dt>
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<dt><span class="chapter"><a href="faq.html">12. FAQ</a></span></dt>
<dt><span class="chapter"><a href="resources.html">13. Contributing to the Yocto Project</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="resources-intro.html">13.1. Introduction</a></span></dt>
<dt><span class="section"><a href="resources-bugtracker.html">13.2. Tracking Bugs</a></span></dt>
<dt><span class="section"><a href="resources-mailinglist.html">13.3. Mailing lists</a></span></dt>
<dt><span class="section"><a href="resources-irc.html">13.4. Internet Relay Chat (IRC)</a></span></dt>
<dt><span class="section"><a href="resources-links.html">13.5. Links</a></span></dt>
<dt><span class="section"><a href="resources-contributions.html">13.6. Contributions</a></span></dt>
</dl></dd>
</dl>
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