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| <a name="boost.random.linear_feedbac_idp99770000"></a><div class="titlepage"></div> |
| <div class="refnamediv"> |
| <h2><span class="refentrytitle">Class template linear_feedback_shift_engine</span></h2> |
| <p>boost::random::linear_feedback_shift_engine</p> |
| </div> |
| <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> |
| <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../boost_random/reference.html#header.boost.random.linear_feedback_shift_hpp" title="Header <boost/random/linear_feedback_shift.hpp>">boost/random/linear_feedback_shift.hpp</a>> |
| |
| </span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> UIntType<span class="special">,</span> <span class="keyword">int</span> w<span class="special">,</span> <span class="keyword">int</span> k<span class="special">,</span> <span class="keyword">int</span> q<span class="special">,</span> <span class="keyword">int</span> s<span class="special">></span> |
| <span class="keyword">class</span> <a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">{</span> |
| <span class="keyword">public</span><span class="special">:</span> |
| <span class="comment">// types</span> |
| <span class="keyword">typedef</span> <span class="identifier">UIntType</span> <a name="boost.random.linear_feedbac_idp99770000.result_type"></a><span class="identifier">result_type</span><span class="special">;</span> |
| |
| <span class="comment">// <a class="link" href="linear_feedbac_idp99770000.html#boost.random.linear_feedbac_idp99770000construct-copy-destruct">construct/copy/destruct</a></span> |
| <a class="link" href="linear_feedbac_idp99770000.html#idp203968176-bb"><span class="identifier">linear_feedback_shift_engine</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">explicit</span> <a class="link" href="linear_feedbac_idp99770000.html#idp193272624-bb"><span class="identifier">linear_feedback_shift_engine</span></a><span class="special">(</span><span class="identifier">UIntType</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> SeedSeq<span class="special">></span> <span class="keyword">explicit</span> <a class="link" href="linear_feedbac_idp99770000.html#idp203964720-bb"><span class="identifier">linear_feedback_shift_engine</span></a><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <a class="link" href="linear_feedbac_idp99770000.html#idp193268832-bb"><span class="identifier">linear_feedback_shift_engine</span></a><span class="special">(</span><span class="identifier">It</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">It</span><span class="special">)</span><span class="special">;</span> |
| |
| <span class="comment">// <a class="link" href="linear_feedbac_idp99770000.html#idp196819392-bb">public static functions</a></span> |
| <span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="linear_feedbac_idp99770000.html#idp196819520-bb"><span class="identifier">min</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="linear_feedbac_idp99770000.html#idp196818112-bb"><span class="identifier">max</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> |
| |
| <span class="comment">// <a class="link" href="linear_feedbac_idp99770000.html#idp196816800-bb">public member functions</a></span> |
| <span class="keyword">void</span> <a class="link" href="linear_feedbac_idp99770000.html#idp196816512-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">void</span> <a class="link" href="linear_feedbac_idp99770000.html#idp196812944-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">UIntType</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> SeedSeq<span class="special">></span> <span class="keyword">void</span> <a class="link" href="linear_feedbac_idp99770000.html#idp89853008-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <span class="keyword">void</span> <a class="link" href="linear_feedbac_idp99770000.html#idp89850464-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">It</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">It</span><span class="special">)</span><span class="special">;</span> |
| <span class="identifier">result_type</span> <a class="link" href="linear_feedbac_idp99770000.html#idp92747200-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Iter<span class="special">></span> <span class="keyword">void</span> <a class="link" href="linear_feedbac_idp99770000.html#idp92746064-bb"><span class="identifier">generate</span></a><span class="special">(</span><span class="identifier">Iter</span><span class="special">,</span> <span class="identifier">Iter</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">void</span> <a class="link" href="linear_feedbac_idp99770000.html#idp92742224-bb"><span class="identifier">discard</span></a><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uintmax_t</span><span class="special">)</span><span class="special">;</span> |
| |
| <span class="comment">// <a class="link" href="linear_feedbac_idp99770000.html#idp193267264-bb">friend functions</a></span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span> |
| <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> |
| <a class="link" href="linear_feedbac_idp99770000.html#idp193267680-bb"><span class="keyword">operator</span><span class="special"><<</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span> |
| <span class="keyword">const</span> <a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span> |
| <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> |
| <a class="link" href="linear_feedbac_idp99770000.html#idp65090992-bb"><span class="keyword">operator</span><span class="special">>></span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span> |
| <span class="keyword">const</span> <a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="linear_feedbac_idp99770000.html#idp65088352-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span><span class="special">,</span> |
| <span class="keyword">const</span> <a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="linear_feedbac_idp99770000.html#idp144993376-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span><span class="special">,</span> |
| <span class="keyword">const</span> <a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> |
| |
| <span class="comment">// public data members</span> |
| <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</span> <span class="identifier">has_fixed_range</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">word_size</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">exponent1</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">exponent2</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">step_size</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">UIntType</span> <span class="identifier">default_seed</span><span class="special">;</span> |
| <span class="special">}</span><span class="special">;</span></pre></div> |
| <div class="refsect1"> |
| <a name="idp399928000"></a><h2>Description</h2> |
| <p>Instatiations of <code class="computeroutput">linear_feedback_shift</code> model a <a class="link" href="../../boost_random/reference.html#boost_random.reference.concepts.pseudo_random_number_generator" title="Pseudo-Random Number Generator">pseudo-random number generator</a> . It was originally proposed in</p> |
| <p> </p> |
| <div class="blockquote"><blockquote class="blockquote"><p> "Random numbers generated by linear recurrence modulo two.", Tausworthe, R. C.(1965), Mathematics of Computation 19, 201-209. </p></blockquote></div> |
| <p> </p> |
| <div class="refsect2"> |
| <a name="idp399931376"></a><h3> |
| <a name="boost.random.linear_feedbac_idp99770000construct-copy-destruct"></a><code class="computeroutput">linear_feedback_shift_engine</code> |
| public |
| construct/copy/destruct</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"> |
| <li class="listitem"> |
| <pre class="literallayout"><a name="idp203968176-bb"></a><span class="identifier">linear_feedback_shift_engine</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> |
| <p>Constructs a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code>, using the default seed. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">explicit</span> <a name="idp193272624-bb"></a><span class="identifier">linear_feedback_shift_engine</span><span class="special">(</span><span class="identifier">UIntType</span> s0<span class="special">)</span><span class="special">;</span></pre> |
| <p>Constructs a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code>, seeding it with s0. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> SeedSeq<span class="special">></span> |
| <span class="keyword">explicit</span> <a name="idp203964720-bb"></a><span class="identifier">linear_feedback_shift_engine</span><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span> seq<span class="special">)</span><span class="special">;</span></pre> |
| <p>Constructs a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code>, seeding it with seq. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <a name="idp193268832-bb"></a><span class="identifier">linear_feedback_shift_engine</span><span class="special">(</span><span class="identifier">It</span> <span class="special">&</span> first<span class="special">,</span> <span class="identifier">It</span> last<span class="special">)</span><span class="special">;</span></pre> |
| <p>Constructs a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code>, seeding it with values from the range [first, last). </p> |
| </li> |
| </ol></div> |
| </div> |
| <div class="refsect2"> |
| <a name="idp399967504"></a><h3> |
| <a name="idp196819392-bb"></a><code class="computeroutput">linear_feedback_shift_engine</code> public static functions</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">result_type</span> <a name="idp196819520-bb"></a><span class="identifier">min</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> |
| <p>Returns the smallest value that the generator can produce. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">result_type</span> <a name="idp196818112-bb"></a><span class="identifier">max</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> |
| <p>Returns the largest value that the generator can produce. </p> |
| </li> |
| </ol></div> |
| </div> |
| <div class="refsect2"> |
| <a name="idp399980096"></a><h3> |
| <a name="idp196816800-bb"></a><code class="computeroutput">linear_feedback_shift_engine</code> public member functions</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">void</span> <a name="idp196816512-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> |
| <p>Seeds a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code> with the default seed. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">void</span> <a name="idp196812944-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">UIntType</span> s0<span class="special">)</span><span class="special">;</span></pre> |
| <p>Seeds a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code> with <code class="computeroutput">s0</code>. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> SeedSeq<span class="special">></span> <span class="keyword">void</span> <a name="idp89853008-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span> seq<span class="special">)</span><span class="special">;</span></pre> |
| <p>Seeds a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code> with values produced by <code class="computeroutput">seq.generate()</code>. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <span class="keyword">void</span> <a name="idp89850464-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">It</span> <span class="special">&</span> first<span class="special">,</span> <span class="identifier">It</span> last<span class="special">)</span><span class="special">;</span></pre> |
| <p>Seeds a <code class="computeroutput"><code class="computeroutput"><a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a></code></code> with values from the range [first, last). </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="identifier">result_type</span> <a name="idp92747200-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> |
| <p>Returns the next value of the generator. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Iter<span class="special">></span> <span class="keyword">void</span> <a name="idp92746064-bb"></a><span class="identifier">generate</span><span class="special">(</span><span class="identifier">Iter</span> first<span class="special">,</span> <span class="identifier">Iter</span> last<span class="special">)</span><span class="special">;</span></pre> |
| <p>Fills a range with random values </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">void</span> <a name="idp92742224-bb"></a><span class="identifier">discard</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uintmax_t</span> z<span class="special">)</span><span class="special">;</span></pre> |
| <p>Advances the state of the generator by <code class="computeroutput">z</code>. </p> |
| </li> |
| </ol></div> |
| </div> |
| <div class="refsect2"> |
| <a name="idp400040528"></a><h3> |
| <a name="idp193267264-bb"></a><code class="computeroutput">linear_feedback_shift_engine</code> friend functions</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span> |
| <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> |
| <a name="idp193267680-bb"></a><span class="keyword">operator</span><span class="special"><<</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> os<span class="special">,</span> |
| <span class="keyword">const</span> <a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span> x<span class="special">)</span><span class="special">;</span></pre> |
| <p>Writes the textual representation of the generator to a <code class="computeroutput">std::ostream</code>. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span> |
| <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> |
| <a name="idp65090992-bb"></a><span class="keyword">operator</span><span class="special">>></span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> is<span class="special">,</span> |
| <span class="keyword">const</span> <a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span> x<span class="special">)</span><span class="special">;</span></pre> |
| <p>Reads the textual representation of the generator from a <code class="computeroutput">std::istream</code>. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="idp65088352-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span> x<span class="special">,</span> |
| <span class="keyword">const</span> <a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span> y<span class="special">)</span><span class="special">;</span></pre> |
| <p>Returns true if the two generators will produce identical sequences of outputs. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="idp144993376-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span> lhs<span class="special">,</span> |
| <span class="keyword">const</span> <a class="link" href="linear_feedbac_idp99770000.html" title="Class template linear_feedback_shift_engine">linear_feedback_shift_engine</a> <span class="special">&</span> rhs<span class="special">)</span><span class="special">;</span></pre> |
| <p>Returns true if the two generators will produce different sequences of outputs. </p> |
| </li> |
| </ol></div> |
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| <td align="right"><div class="copyright-footer">Copyright © 2000-2005 Jens Maurer<br>Copyright © 2009, 2010 Steven Watanabe<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) |
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