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<title>Class: Ankusa::Classifier</title>
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<div id="classHeader">
<table class="header-table">
<tr class="top-aligned-row">
<td><strong>Class</strong></td>
<td class="class-name-in-header">Ankusa::Classifier</td>
</tr>
<tr class="top-aligned-row">
<td><strong>In:</strong></td>
<td>
<a href="../../files/lib/ankusa/classifier_rb.html">
lib/ankusa/classifier.rb
</a>
<br />
</td>
</tr>
<tr class="top-aligned-row">
<td><strong>Parent:</strong></td>
<td>
Object
</td>
</tr>
</table>
</div>
<!-- banner header -->
<div id="bodyContent">
<div id="contextContent">
</div>
<div id="method-list">
<h3 class="section-bar">Methods</h3>
<div class="name-list">
<a href="#M000005">classifications</a>
<a href="#M000004">classify</a>
<a href="#M000009">doc_count_total</a>
<a href="#M000007">drop_tables</a>
<a href="#M000013">freq_table</a>
<a href="#M000010">get_word_probs</a>
<a href="#M000011">init_tables</a>
<a href="#M000001">new</a>
<a href="#M000006">refresh_classnames</a>
<a href="#M000008">reset</a>
<a href="#M000012">summary_table</a>
<a href="#M000002">train</a>
<a href="#M000003">untrain</a>
</div>
</div>
</div>
<!-- if includes -->
<div id="section">
<div id="attribute-list">
<h3 class="section-bar">Attributes</h3>
<div class="name-list">
<table>
<tr class="top-aligned-row context-row">
<td class="context-item-name">classnames</td>
<td class="context-item-value"> [R] </td>
<td class="context-item-desc"></td>
</tr>
</table>
</div>
</div>
<!-- if method_list -->
<div id="methods">
<h3 class="section-bar">Public Class methods</h3>
<div id="method-M000001" class="method-detail">
<a name="M000001"></a>
<div class="method-heading">
<a href="#M000001" class="method-signature">
<span class="method-name">new</span><span class="method-args">(hbase_client, frequency_tablename="ankusa_word_frequencies", summary_tablename="ankusa_summary")</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000001-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000001-source">
<pre>
<span class="ruby-comment cmt"># File lib/ankusa/classifier.rb, line 7</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">initialize</span>(<span class="ruby-identifier">hbase_client</span>, <span class="ruby-identifier">frequency_tablename</span>=<span class="ruby-value str">"ankusa_word_frequencies"</span>, <span class="ruby-identifier">summary_tablename</span>=<span class="ruby-value str">"ankusa_summary"</span>)
<span class="ruby-ivar">@hbase</span> = <span class="ruby-identifier">hbase_client</span>
<span class="ruby-ivar">@ftablename</span> = <span class="ruby-identifier">frequency_tablename</span>
<span class="ruby-ivar">@stablename</span> = <span class="ruby-identifier">summary_tablename</span>
<span class="ruby-identifier">init_tables</span>
<span class="ruby-ivar">@classnames</span> = <span class="ruby-identifier">refresh_classnames</span>
<span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<h3 class="section-bar">Public Instance methods</h3>
<div id="method-M000005" class="method-detail">
<a name="M000005"></a>
<div class="method-heading">
<a href="#M000005" class="method-signature">
<span class="method-name">classifications</span><span class="method-args">(text)</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000005-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000005-source">
<pre>
<span class="ruby-comment cmt"># File lib/ankusa/classifier.rb, line 39</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">classifications</span>(<span class="ruby-identifier">text</span>)
<span class="ruby-identifier">classes</span> = {}
<span class="ruby-identifier">result</span> = {}
<span class="ruby-ivar">@classnames</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">k</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">classes</span>[<span class="ruby-identifier">k</span>] = <span class="ruby-constant">NBClass</span>.<span class="ruby-identifier">new</span> <span class="ruby-identifier">k</span>, <span class="ruby-identifier">summary_table</span>, <span class="ruby-identifier">freq_table</span>
<span class="ruby-identifier">result</span>[<span class="ruby-identifier">k</span>] = <span class="ruby-value">0</span>
}
<span class="ruby-constant">TextHash</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">text</span>).<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">word</span>,<span class="ruby-identifier">count</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">probs</span> = <span class="ruby-identifier">get_word_probs</span>(<span class="ruby-identifier">word</span>, <span class="ruby-identifier">classes</span>)
<span class="ruby-ivar">@classnames</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">k</span><span class="ruby-operator">|</span> <span class="ruby-identifier">result</span>[<span class="ruby-identifier">k</span>] <span class="ruby-operator">+=</span> <span class="ruby-constant">Math</span>.<span class="ruby-identifier">log</span>(<span class="ruby-identifier">probs</span>[<span class="ruby-identifier">k</span>]) }
}
<span class="ruby-ivar">@classnames</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">k</span><span class="ruby-operator">|</span> <span class="ruby-identifier">result</span>[<span class="ruby-identifier">k</span>] <span class="ruby-operator">+=</span> <span class="ruby-constant">Math</span>.<span class="ruby-identifier">log</span>(<span class="ruby-identifier">classes</span>[<span class="ruby-identifier">k</span>].<span class="ruby-identifier">doc_count</span> <span class="ruby-operator">/</span> <span class="ruby-identifier">doc_count_total</span>) }
<span class="ruby-identifier">result</span>.<span class="ruby-identifier">keys</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">k</span><span class="ruby-operator">|</span> <span class="ruby-identifier">result</span>[<span class="ruby-identifier">k</span>] = <span class="ruby-constant">Math</span>.<span class="ruby-identifier">exp</span>(<span class="ruby-identifier">result</span>[<span class="ruby-identifier">k</span>]) }
<span class="ruby-identifier">sum</span> = <span class="ruby-identifier">result</span>.<span class="ruby-identifier">values</span>.<span class="ruby-identifier">inject</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">x</span>,<span class="ruby-identifier">y</span><span class="ruby-operator">|</span> <span class="ruby-identifier">x</span><span class="ruby-operator">+</span><span class="ruby-identifier">y</span> }
<span class="ruby-identifier">result</span>.<span class="ruby-identifier">keys</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">klass</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">result</span>[<span class="ruby-identifier">klass</span>] = <span class="ruby-identifier">result</span>[<span class="ruby-identifier">klass</span>] <span class="ruby-operator">/</span> <span class="ruby-identifier">sum</span>
}
<span class="ruby-identifier">result</span>
<span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000004" class="method-detail">
<a name="M000004"></a>
<div class="method-heading">
<a href="#M000004" class="method-signature">
<span class="method-name">classify</span><span class="method-args">(text)</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000004-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000004-source">
<pre>
<span class="ruby-comment cmt"># File lib/ankusa/classifier.rb, line 34</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">classify</span>(<span class="ruby-identifier">text</span>)
<span class="ruby-comment cmt"># return the most probable class</span>
<span class="ruby-identifier">classifications</span>(<span class="ruby-identifier">text</span>).<span class="ruby-identifier">sort</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">o</span>,<span class="ruby-identifier">t</span><span class="ruby-operator">|</span> <span class="ruby-identifier">o</span>[<span class="ruby-value">1</span>] <span class="ruby-operator"><=></span> <span class="ruby-identifier">t</span>[<span class="ruby-value">1</span>] }.<span class="ruby-identifier">first</span>.<span class="ruby-identifier">first</span>
<span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000009" class="method-detail">
<a name="M000009"></a>
<div class="method-heading">
<a href="#M000009" class="method-signature">
<span class="method-name">doc_count_total</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000009-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000009-source">
<pre>
<span class="ruby-comment cmt"># File lib/ankusa/classifier.rb, line 84</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">doc_count_total</span>
<span class="ruby-identifier">total</span> = <span class="ruby-value">0</span>
<span class="ruby-identifier">summary_table</span>.<span class="ruby-identifier">create_scanner</span>(<span class="ruby-value str">""</span>, <span class="ruby-value str">"totals:doccount"</span>) { <span class="ruby-operator">|</span><span class="ruby-identifier">row</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">total</span> <span class="ruby-operator">+=</span> <span class="ruby-identifier">row</span>.<span class="ruby-identifier">columns</span>[<span class="ruby-value str">"totals:doccount"</span>].<span class="ruby-identifier">to_i64</span>
}
<span class="ruby-identifier">total</span>
<span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000007" class="method-detail">
<a name="M000007"></a>
<div class="method-heading">
<a href="#M000007" class="method-signature">
<span class="method-name">drop_tables</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000007-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000007-source">
<pre>
<span class="ruby-comment cmt"># File lib/ankusa/classifier.rb, line 72</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">drop_tables</span>
<span class="ruby-identifier">freq_table</span>.<span class="ruby-identifier">delete</span>
<span class="ruby-identifier">summary_table</span>.<span class="ruby-identifier">delete</span>
<span class="ruby-ivar">@stable</span> = <span class="ruby-keyword kw">nil</span>
<span class="ruby-ivar">@ftable</span> = <span class="ruby-keyword kw">nil</span>
<span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000006" class="method-detail">
<a name="M000006"></a>
<div class="method-heading">
<a href="#M000006" class="method-signature">
<span class="method-name">refresh_classnames</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p>
get all classes
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000006-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000006-source">
<pre>
<span class="ruby-comment cmt"># File lib/ankusa/classifier.rb, line 64</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">refresh_classnames</span>
<span class="ruby-identifier">cs</span> = []
<span class="ruby-identifier">summary_table</span>.<span class="ruby-identifier">create_scanner</span>(<span class="ruby-value str">""</span>, <span class="ruby-value str">"totals"</span>) { <span class="ruby-operator">|</span><span class="ruby-identifier">row</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">cs</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">row</span>.<span class="ruby-identifier">row</span>.<span class="ruby-identifier">intern</span>
}
<span class="ruby-identifier">cs</span>
<span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000008" class="method-detail">
<a name="M000008"></a>
<div class="method-heading">
<a href="#M000008" class="method-signature">
<span class="method-name">reset</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000008-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000008-source">
<pre>
<span class="ruby-comment cmt"># File lib/ankusa/classifier.rb, line 79</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">reset</span>
<span class="ruby-identifier">drop_tables</span>
<span class="ruby-identifier">init_tables</span>
<span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000002" class="method-detail">
<a name="M000002"></a>
<div class="method-heading">
<a href="#M000002" class="method-signature">
<span class="method-name">train</span><span class="method-args">(klass, text)</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000002-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000002-source">
<pre>
<span class="ruby-comment cmt"># File lib/ankusa/classifier.rb, line 15</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">train</span>(<span class="ruby-identifier">klass</span>, <span class="ruby-identifier">text</span>)
<span class="ruby-identifier">th</span> = <span class="ruby-constant">TextHash</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">text</span>)
<span class="ruby-identifier">th</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">word</span>, <span class="ruby-identifier">count</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">freq_table</span>.<span class="ruby-identifier">atomic_increment</span> <span class="ruby-identifier">word</span>, <span class="ruby-node">"classes:#{klass.to_s}"</span>, <span class="ruby-identifier">count</span>
}
<span class="ruby-identifier">summary_table</span>.<span class="ruby-identifier">atomic_increment</span> <span class="ruby-identifier">klass</span>, <span class="ruby-value str">"totals:wordcount"</span>, <span class="ruby-identifier">th</span>.<span class="ruby-identifier">word_count</span>
<span class="ruby-identifier">summary_table</span>.<span class="ruby-identifier">atomic_increment</span> <span class="ruby-identifier">klass</span>, <span class="ruby-value str">"totals:doccount"</span>
<span class="ruby-ivar">@classnames</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">klass</span> <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">not</span> <span class="ruby-ivar">@classnames</span>.<span class="ruby-identifier">include?</span> <span class="ruby-identifier">klass</span>
<span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000003" class="method-detail">
<a name="M000003"></a>
<div class="method-heading">
<a href="#M000003" class="method-signature">
<span class="method-name">untrain</span><span class="method-args">(klass, text)</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000003-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000003-source">
<pre>
<span class="ruby-comment cmt"># File lib/ankusa/classifier.rb, line 25</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">untrain</span>(<span class="ruby-identifier">klass</span>, <span class="ruby-identifier">text</span>)
<span class="ruby-identifier">th</span> = <span class="ruby-constant">TextHash</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">text</span>)
<span class="ruby-identifier">th</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">word</span>, <span class="ruby-identifier">count</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">freq_table</span>.<span class="ruby-identifier">atomic_increment</span> <span class="ruby-identifier">word</span>, <span class="ruby-node">"classes:#{klass.to_s}"</span>, <span class="ruby-operator">-</span><span class="ruby-identifier">count</span>
}
<span class="ruby-identifier">summary_table</span>.<span class="ruby-identifier">atomic_increment</span> <span class="ruby-identifier">klass</span>, <span class="ruby-value str">"totals:wordcount"</span>, <span class="ruby-operator">-</span><span class="ruby-identifier">th</span>.<span class="ruby-identifier">word_count</span>
<span class="ruby-identifier">summary_table</span>.<span class="ruby-identifier">atomic_increment</span> <span class="ruby-identifier">klass</span>, <span class="ruby-value str">"totals:doccount"</span>, <span class="ruby-value">-1</span>
<span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<h3 class="section-bar">Protected Instance methods</h3>
<div id="method-M000013" class="method-detail">
<a name="M000013"></a>
<div class="method-heading">
<a href="#M000013" class="method-signature">
<span class="method-name">freq_table</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000013-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000013-source">
<pre>
<span class="ruby-comment cmt"># File lib/ankusa/classifier.rb, line 120</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">freq_table</span>
<span class="ruby-ivar">@ftable</span> <span class="ruby-operator">||=</span> <span class="ruby-ivar">@hbase</span>.<span class="ruby-identifier">get_table</span> <span class="ruby-ivar">@ftablename</span>
<span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000010" class="method-detail">
<a name="M000010"></a>
<div class="method-heading">
<a href="#M000010" class="method-signature">
<span class="method-name">get_word_probs</span><span class="method-args">(word, classes)</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000010-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000010-source">
<pre>
<span class="ruby-comment cmt"># File lib/ankusa/classifier.rb, line 93</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">get_word_probs</span>(<span class="ruby-identifier">word</span>, <span class="ruby-identifier">classes</span>)
<span class="ruby-identifier">probs</span> = {}
<span class="ruby-ivar">@classnames</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">cn</span><span class="ruby-operator">|</span> <span class="ruby-identifier">probs</span>[<span class="ruby-identifier">cn</span>] = <span class="ruby-constant">Ankusa</span><span class="ruby-operator">::</span><span class="ruby-constant">SMALL_PROB</span> <span class="ruby-operator">/</span> <span class="ruby-identifier">classes</span>[<span class="ruby-identifier">cn</span>].<span class="ruby-identifier">word_count</span> }
<span class="ruby-identifier">row</span> = <span class="ruby-identifier">freq_table</span>.<span class="ruby-identifier">get_row</span>(<span class="ruby-identifier">word</span>)
<span class="ruby-keyword kw">return</span> <span class="ruby-identifier">probs</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">row</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span>
<span class="ruby-identifier">row</span>.<span class="ruby-identifier">first</span>.<span class="ruby-identifier">columns</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">colname</span>, <span class="ruby-identifier">cell</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">classname</span> = <span class="ruby-identifier">colname</span>.<span class="ruby-identifier">split</span>(<span class="ruby-value str">':'</span>)[<span class="ruby-value">1</span>].<span class="ruby-identifier">intern</span>
<span class="ruby-identifier">probs</span>[<span class="ruby-identifier">classname</span>] = <span class="ruby-identifier">cell</span>.<span class="ruby-identifier">to_i64</span>.<span class="ruby-identifier">to_f</span> <span class="ruby-operator">/</span> <span class="ruby-identifier">classes</span>[<span class="ruby-identifier">classname</span>].<span class="ruby-identifier">word_count</span>
}
<span class="ruby-identifier">probs</span>
<span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000011" class="method-detail">
<a name="M000011"></a>
<div class="method-heading">
<a href="#M000011" class="method-signature">
<span class="method-name">init_tables</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000011-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000011-source">
<pre>
<span class="ruby-comment cmt"># File lib/ankusa/classifier.rb, line 106</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">init_tables</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">not</span> <span class="ruby-ivar">@hbase</span>.<span class="ruby-identifier">has_table?</span> <span class="ruby-ivar">@ftablename</span>
<span class="ruby-ivar">@hbase</span>.<span class="ruby-identifier">create_table</span> <span class="ruby-ivar">@ftablename</span>, <span class="ruby-value str">"classes"</span>, <span class="ruby-value str">"total"</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">not</span> <span class="ruby-ivar">@hbase</span>.<span class="ruby-identifier">has_table?</span> <span class="ruby-ivar">@stablename</span>
<span class="ruby-ivar">@hbase</span>.<span class="ruby-identifier">create_table</span> <span class="ruby-ivar">@stablename</span>, <span class="ruby-value str">"totals"</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span>
</pre>
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<div id="method-M000012" class="method-detail">
<a name="M000012"></a>
<div class="method-heading">
<a href="#M000012" class="method-signature">
<span class="method-name">summary_table</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000012-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000012-source">
<pre>
<span class="ruby-comment cmt"># File lib/ankusa/classifier.rb, line 116</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">summary_table</span>
<span class="ruby-ivar">@stable</span> <span class="ruby-operator">||=</span> <span class="ruby-ivar">@hbase</span>.<span class="ruby-identifier">get_table</span> <span class="ruby-ivar">@stablename</span>
<span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
</div>
</div>
<div id="validator-badges">
<p><small><a href="http://validator.w3.org/check/referer">[Validate]</a></small></p>
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