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&#160;<span id="projectnumber">6.0</span>
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<a href="#pub-methods">Public Member Functions</a> &#124;
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<div class="title">ON_CheckSum Class Reference</div> </div>
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<p><code>#include &lt;<a class="el" href="../../d1/d90/opennurbs__string_8h_source.html">opennurbs_string.h</a>&gt;</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:ae2bb55ba95c55ece949de422e595e502"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#ae2bb55ba95c55ece949de422e595e502">ON_CheckSum</a> ()</td></tr>
<tr class="separator:ae2bb55ba95c55ece949de422e595e502"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a21cd11655de321258ceeff36f3d3f16a"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#a21cd11655de321258ceeff36f3d3f16a">~ON_CheckSum</a> ()</td></tr>
<tr class="separator:a21cd11655de321258ceeff36f3d3f16a"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:af8acd8658f52e9e815b84b7c1c442ee0"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#af8acd8658f52e9e815b84b7c1c442ee0">CheckBuffer</a> (size_t size, const void *buffer) const</td></tr>
<tr class="separator:af8acd8658f52e9e815b84b7c1c442ee0"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a40748609803e6155dd23d108d6032085"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#a40748609803e6155dd23d108d6032085">CheckFile</a> (FILE *fp, bool bSkipTimeCheck=false) const</td></tr>
<tr class="separator:a40748609803e6155dd23d108d6032085"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:af14371612ad39359960a8e5a7d09f876"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#af14371612ad39359960a8e5a7d09f876">CheckFile</a> (const wchar_t *filename, bool bSkipTimeCheck=false) const</td></tr>
<tr class="separator:af14371612ad39359960a8e5a7d09f876"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ad9dbd1fc89fbfdc7b500ee426b49ab8f"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#ad9dbd1fc89fbfdc7b500ee426b49ab8f">Dump</a> (class <a class="el" href="../../d2/da3/class_o_n___text_log.html">ON_TextLog</a> &amp;) const</td></tr>
<tr class="separator:ad9dbd1fc89fbfdc7b500ee426b49ab8f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a94a18b4b9ba27278373a9ae731f06801"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#a94a18b4b9ba27278373a9ae731f06801">IsSet</a> () const</td></tr>
<tr class="separator:a94a18b4b9ba27278373a9ae731f06801"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a9a8bec43be808971b12830c7f61008a3"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#a9a8bec43be808971b12830c7f61008a3">Read</a> (class <a class="el" href="../../db/d16/class_o_n___binary_archive.html">ON_BinaryArchive</a> &amp;)</td></tr>
<tr class="separator:a9a8bec43be808971b12830c7f61008a3"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aec6e48caad3cca8d498d7a307f8f4111"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#aec6e48caad3cca8d498d7a307f8f4111">SetBufferCheckSum</a> (size_t size, const void *buffer, time_t time)</td></tr>
<tr class="separator:aec6e48caad3cca8d498d7a307f8f4111"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a030a0e5a13f46a537cbea9dc8fbebe8b"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#a030a0e5a13f46a537cbea9dc8fbebe8b">SetFileCheckSum</a> (FILE *fp)</td></tr>
<tr class="separator:a030a0e5a13f46a537cbea9dc8fbebe8b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aff98e21d44dc1dd1161c21b71944d995"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#aff98e21d44dc1dd1161c21b71944d995">SetFileCheckSum</a> (const wchar_t *filename)</td></tr>
<tr class="separator:aff98e21d44dc1dd1161c21b71944d995"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a0509902eef0fc6f7b5479f9e430534cb"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#a0509902eef0fc6f7b5479f9e430534cb">Write</a> (class <a class="el" href="../../db/d16/class_o_n___binary_archive.html">ON_BinaryArchive</a> &amp;) const</td></tr>
<tr class="separator:a0509902eef0fc6f7b5479f9e430534cb"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a4e9411ba8b23fc2c43f7f3aae6e8aaf4"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#a4e9411ba8b23fc2c43f7f3aae6e8aaf4">Zero</a> ()</td></tr>
<tr class="memdesc:a4e9411ba8b23fc2c43f7f3aae6e8aaf4"><td class="mdescLeft">&#160;</td><td class="mdescRight">zeros all fields. <a href="#a4e9411ba8b23fc2c43f7f3aae6e8aaf4">More...</a><br /></td></tr>
<tr class="separator:a4e9411ba8b23fc2c43f7f3aae6e8aaf4"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-attribs"></a>
Public Attributes</h2></td></tr>
<tr class="memitem:a77e35311c95748afbb533b316e49a546"><td class="memItemLeft" align="right" valign="top">ON__UINT32&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#a77e35311c95748afbb533b316e49a546">m_crc</a> [8]</td></tr>
<tr class="memdesc:a77e35311c95748afbb533b316e49a546"><td class="mdescLeft">&#160;</td><td class="mdescRight">crc's <a href="#a77e35311c95748afbb533b316e49a546">More...</a><br /></td></tr>
<tr class="separator:a77e35311c95748afbb533b316e49a546"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a438ad14a033015a42ae7022debf77e96"><td class="memItemLeft" align="right" valign="top">size_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#a438ad14a033015a42ae7022debf77e96">m_size</a></td></tr>
<tr class="memdesc:a438ad14a033015a42ae7022debf77e96"><td class="mdescLeft">&#160;</td><td class="mdescRight">bytes in the file. <a href="#a438ad14a033015a42ae7022debf77e96">More...</a><br /></td></tr>
<tr class="separator:a438ad14a033015a42ae7022debf77e96"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a13c80580438ce987a6d3016b0006a9ac"><td class="memItemLeft" align="right" valign="top">time_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#a13c80580438ce987a6d3016b0006a9ac">m_time</a></td></tr>
<tr class="memdesc:a13c80580438ce987a6d3016b0006a9ac"><td class="mdescLeft">&#160;</td><td class="mdescRight">last modified time in seconds since Jan 1, 1970, UCT <a href="#a13c80580438ce987a6d3016b0006a9ac">More...</a><br /></td></tr>
<tr class="separator:a13c80580438ce987a6d3016b0006a9ac"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-attribs"></a>
Static Public Attributes</h2></td></tr>
<tr class="memitem:afeb369962ab0ed0a3ce33fc7ba44b3e7"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="../../dd/d50/class_o_n___check_sum.html">ON_CheckSum</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d50/class_o_n___check_sum.html#afeb369962ab0ed0a3ce33fc7ba44b3e7">UnsetCheckSum</a></td></tr>
<tr class="separator:afeb369962ab0ed0a3ce33fc7ba44b3e7"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>This class is intended to be used to determine if a file's contents have changed. </p>
</div><h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
<a id="ae2bb55ba95c55ece949de422e595e502"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ae2bb55ba95c55ece949de422e595e502">&#9670;&nbsp;</a></span>ON_CheckSum()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">ON_CheckSum::ON_CheckSum </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a id="a21cd11655de321258ceeff36f3d3f16a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a21cd11655de321258ceeff36f3d3f16a">&#9670;&nbsp;</a></span>~ON_CheckSum()</h2>
<div class="memitem">
<div class="memproto">
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<td class="memname">ON_CheckSum::~ON_CheckSum </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<h2 class="groupheader">Member Function Documentation</h2>
<a id="af8acd8658f52e9e815b84b7c1c442ee0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#af8acd8658f52e9e815b84b7c1c442ee0">&#9670;&nbsp;</a></span>CheckBuffer()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">bool ON_CheckSum::CheckBuffer </td>
<td>(</td>
<td class="paramtype">size_t&#160;</td>
<td class="paramname"><em>size</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const void *&#160;</td>
<td class="paramname"><em>buffer</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const</td>
</tr>
</table>
</div><div class="memdoc">
<p>Description: Test buffer to see if it has a matching checksum. Paramters: size - [in] size in bytes buffer - [in] Returns: True if the buffer has a matching checksum. </p>
</div>
</div>
<a id="a40748609803e6155dd23d108d6032085"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a40748609803e6155dd23d108d6032085">&#9670;&nbsp;</a></span>CheckFile() <span class="overload">[1/2]</span></h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">bool ON_CheckSum::CheckFile </td>
<td>(</td>
<td class="paramtype">FILE *&#160;</td>
<td class="paramname"><em>fp</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool&#160;</td>
<td class="paramname"><em>bSkipTimeCheck</em> = <code>false</code>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const</td>
</tr>
</table>
</div><div class="memdoc">
<p>Description: Test buffer to see if it has a matching checksum. Paramters: fp - [in] pointer to file opened with ON::OpenFile(...,"rb") bSkipTimeCheck - [in] if true, the time of last modification is not checked. Returns: True if the file has a matching checksum. </p>
</div>
</div>
<a id="af14371612ad39359960a8e5a7d09f876"></a>
<h2 class="memtitle"><span class="permalink"><a href="#af14371612ad39359960a8e5a7d09f876">&#9670;&nbsp;</a></span>CheckFile() <span class="overload">[2/2]</span></h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">bool ON_CheckSum::CheckFile </td>
<td>(</td>
<td class="paramtype">const wchar_t *&#160;</td>
<td class="paramname"><em>filename</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool&#160;</td>
<td class="paramname"><em>bSkipTimeCheck</em> = <code>false</code>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const</td>
</tr>
</table>
</div><div class="memdoc">
<p>Description: Test buffer to see if it has a matching checksum. Paramters: filename - [in] bSkipTimeCheck - [in] if true, the time of last modification is not checked. Returns: True if the file has a matching checksum. </p>
</div>
</div>
<a id="ad9dbd1fc89fbfdc7b500ee426b49ab8f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ad9dbd1fc89fbfdc7b500ee426b49ab8f">&#9670;&nbsp;</a></span>Dump()</h2>
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<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void ON_CheckSum::Dump </td>
<td>(</td>
<td class="paramtype">class <a class="el" href="../../d2/da3/class_o_n___text_log.html">ON_TextLog</a> &amp;&#160;</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a id="a94a18b4b9ba27278373a9ae731f06801"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a94a18b4b9ba27278373a9ae731f06801">&#9670;&nbsp;</a></span>IsSet()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">bool ON_CheckSum::IsSet </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
</tr>
</table>
</div><div class="memdoc">
<p>Returns: True if checksum is set. </p>
</div>
</div>
<a id="a9a8bec43be808971b12830c7f61008a3"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a9a8bec43be808971b12830c7f61008a3">&#9670;&nbsp;</a></span>Read()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">bool ON_CheckSum::Read </td>
<td>(</td>
<td class="paramtype">class <a class="el" href="../../db/d16/class_o_n___binary_archive.html">ON_BinaryArchive</a> &amp;&#160;</td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a id="aec6e48caad3cca8d498d7a307f8f4111"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aec6e48caad3cca8d498d7a307f8f4111">&#9670;&nbsp;</a></span>SetBufferCheckSum()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">bool ON_CheckSum::SetBufferCheckSum </td>
<td>(</td>
<td class="paramtype">size_t&#160;</td>
<td class="paramname"><em>size</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const void *&#160;</td>
<td class="paramname"><em>buffer</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">time_t&#160;</td>
<td class="paramname"><em>time</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>C++ default operator=, operator==, and copy constructor work fine. Descripton: Set check sum values for a buffer Parameters: size - [in] number of bytes in buffer buffer - [in] time - [in] last modified time in seconds since Jan 1, 1970, UCT Returns: True if checksum is set. </p>
</div>
</div>
<a id="a030a0e5a13f46a537cbea9dc8fbebe8b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a030a0e5a13f46a537cbea9dc8fbebe8b">&#9670;&nbsp;</a></span>SetFileCheckSum() <span class="overload">[1/2]</span></h2>
<div class="memitem">
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<td class="memname">bool ON_CheckSum::SetFileCheckSum </td>
<td>(</td>
<td class="paramtype">FILE *&#160;</td>
<td class="paramname"><em>fp</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Descripton: Set check sum values for a file. Parameters: fp - [in] pointer to a file opened with ON:FileOpen(...,"rb") Returns: True if checksum is set. </p>
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</div>
<a id="aff98e21d44dc1dd1161c21b71944d995"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aff98e21d44dc1dd1161c21b71944d995">&#9670;&nbsp;</a></span>SetFileCheckSum() <span class="overload">[2/2]</span></h2>
<div class="memitem">
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<td class="memname">bool ON_CheckSum::SetFileCheckSum </td>
<td>(</td>
<td class="paramtype">const wchar_t *&#160;</td>
<td class="paramname"><em>filename</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Descripton: Set check sum values for a file. Parameters: filename - [in] name of file. Returns: True if checksum is set. </p>
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</div>
<a id="a0509902eef0fc6f7b5479f9e430534cb"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a0509902eef0fc6f7b5479f9e430534cb">&#9670;&nbsp;</a></span>Write()</h2>
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<td class="memname">bool ON_CheckSum::Write </td>
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<h2 class="memtitle"><span class="permalink"><a href="#a4e9411ba8b23fc2c43f7f3aae6e8aaf4">&#9670;&nbsp;</a></span>Zero()</h2>
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<td class="memname">void ON_CheckSum::Zero </td>
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<p>zeros all fields. </p>
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<h2 class="groupheader">Member Data Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a77e35311c95748afbb533b316e49a546">&#9670;&nbsp;</a></span>m_crc</h2>
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<td class="memname">ON__UINT32 ON_CheckSum::m_crc[8]</td>
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<p>crc's </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a438ad14a033015a42ae7022debf77e96">&#9670;&nbsp;</a></span>m_size</h2>
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<td class="memname">size_t ON_CheckSum::m_size</td>
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<p>bytes in the file. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a13c80580438ce987a6d3016b0006a9ac">&#9670;&nbsp;</a></span>m_time</h2>
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<td class="memname">time_t ON_CheckSum::m_time</td>
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<p>last modified time in seconds since Jan 1, 1970, UCT </p>
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<h2 class="memtitle"><span class="permalink"><a href="#afeb369962ab0ed0a3ce33fc7ba44b3e7">&#9670;&nbsp;</a></span>UnsetCheckSum</h2>
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<td class="memname">const <a class="el" href="../../dd/d50/class_o_n___check_sum.html">ON_CheckSum</a> ON_CheckSum::UnsetCheckSum</td>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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