157 lines
13 KiB
HTML
157 lines
13 KiB
HTML
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<title>std::multimap<Key,T,Compare,Allocator>::end, std::multimap<Key,T,Compare,Allocator>::cend</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::multimap<Key,T,Compare,Allocator>::</span>end, <span style="font-size:0.7em; line-height:130%">std::multimap<Key,T,Compare,Allocator>::</span>cend</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-container.html">container</a>‎ | <a href="cpp-container-multimap.html">multimap</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<div class="t-page-template" style="">
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<p></p>
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</div>
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<table class="t-dcl-begin">
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<tbody></tbody>
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<tbody class="t-dcl-rev">
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<tr class="t-dcl t-until-cxx11">
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<td>
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<div><span class="mw-geshi cpp source-cpp">iterator end<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp">iterator end<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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</tbody>
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<tbody></tbody>
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<div><span class="mw-geshi cpp source-cpp">const_iterator end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp">const_iterator end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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</tr>
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</tbody>
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<tbody>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp">const_iterator cend<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<p>返回指向 <code>multimap</code> 末元素后一元素的迭代器。</p>
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<p>此元素表现为占位符;试图访问它导致未定义行为。</p>
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<div class="t-image">
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<p><img alt="range-begin-end.svg" src="range-begin-end.svg" width="546" height="157" /></p>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<p>(无)</p>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>指向后随最后元素的迭代器。</p>
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<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">复杂度</span></h3>
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<p>常数。</p>
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<p><br /></p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <algorithm></span>
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<span class="co2">#include <cassert></span>
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<span class="co2">#include <iostream></span>
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<span class="co2">#include <map></span>
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<span class="co2">#include <string></span>
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<span class="co2">#include <cstddef></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw4">auto</span> show_node <span class="sy1">=</span> <span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&</span> node, <span class="kw4">char</span> ending <span class="sy1">=</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="br0">)</span> <span class="br0">{</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"{ "</span> <span class="sy1"><<</span> node.<span class="me1">first</span> <span class="sy1"><<</span> <span class="st0">", "</span> <span class="sy1"><<</span> node.<span class="me1">second</span> <span class="sy1"><<</span> <span class="st0">" }"</span> <span class="sy1"><<</span> ending<span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<a href="cpp-container-multimap.html"><span class="kw1285">std::<span class="me2">multimap</span></span></a><span class="sy1"><</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a>, <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">></span> mmap<span class="sy4">;</span>
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<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>mmap.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> mmap.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// OK</span>
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<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>mmap.<span class="me1">cbegin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> mmap.<span class="me1">cend</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// OK</span>
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mmap.<span class="me1">insert</span><span class="br0">(</span><span class="br0">{</span> sizeof<span class="br0">(</span><span class="kw4">long</span><span class="br0">)</span>, <span class="st0">"LONG"</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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show_node<span class="br0">(</span><span class="sy2">*</span><span class="br0">(</span>mmap.<span class="me1">cbegin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>mmap.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> mmap.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// OK</span>
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<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>mmap.<span class="me1">cbegin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> mmap.<span class="me1">cend</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// OK</span>
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mmap.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">></span>second <span class="sy1">=</span> <span class="st0">"long"</span><span class="sy4">;</span>
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show_node<span class="br0">(</span><span class="sy2">*</span><span class="br0">(</span>mmap.<span class="me1">cbegin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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mmap.<span class="me1">insert</span><span class="br0">(</span><span class="br0">{</span> sizeof<span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span>, <span class="st0">"int"</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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show_node<span class="br0">(</span><span class="sy2">*</span>mmap.<span class="me1">cbegin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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mmap.<span class="me1">insert</span><span class="br0">(</span><span class="br0">{</span> sizeof<span class="br0">(</span><span class="kw4">short</span><span class="br0">)</span>, <span class="st0">"short"</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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show_node<span class="br0">(</span><span class="sy2">*</span>mmap.<span class="me1">cbegin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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mmap.<span class="me1">insert</span><span class="br0">(</span><span class="br0">{</span> sizeof<span class="br0">(</span><span class="kw4">char</span><span class="br0">)</span>, <span class="st0">"char"</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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show_node<span class="br0">(</span><span class="sy2">*</span>mmap.<span class="me1">cbegin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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mmap.<span class="me1">insert</span><span class="br0">(</span><span class="br0">{</span><span class="br0">{</span> sizeof<span class="br0">(</span><span class="kw4">float</span><span class="br0">)</span>, <span class="st0">"float"</span> <span class="br0">}</span>, <span class="br0">{</span> sizeof<span class="br0">(</span><span class="kw4">double</span><span class="br0">)</span>, <span class="st0">"double"</span> <span class="br0">}</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"mmap = { "</span><span class="sy4">;</span>
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<a href="cpp-algorithm-for_each.html"><span class="kw1568">std::<span class="me2">for_each</span></span></a><span class="br0">(</span>mmap.<span class="me1">cbegin</span><span class="br0">(</span><span class="br0">)</span>, mmap.<span class="me1">cend</span><span class="br0">(</span><span class="br0">)</span>, <span class="br0">[</span><span class="sy3">&</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&</span> n<span class="br0">)</span> <span class="br0">{</span> show_node<span class="br0">(</span>n, <span class="st0">' '</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"};<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>可能的输出:</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">{ 8, LONG }
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{ 8, long }
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{ 4, int }
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{ 2, short }
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{ 1, char }
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mmap = { { 1, char } { 2, short } { 4, int } { 4, float } { 8, long } { 8, double } };</pre></div>
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</div>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-container-multimap-begin.html"><span class="t-lines"><span>begin</span> <span>cbegin</span></span></a></div>
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<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>返回指向起始的迭代器<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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