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<div class="title">StopAnalyzer.cs</div> </div>
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<a href="_stop_analyzer_8cs.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/* </span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> * contributor license agreements. See the NOTICE file distributed with</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> * this work for additional information regarding copyright ownership.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> * (the &quot;License&quot;); you may not use this file except in compliance with</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> * the License. You may obtain a copy of the License at</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> * </span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> * </span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> * Unless required by applicable law or agreed to in writing, software</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> * distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> * See the License for the specific language governing permissions and</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"> * limitations under the License.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="keyword">using</span> System.Collections.Generic;</div>
<div class="line"><a name="l00019"></a><span class="lineno"><a class="code" href="_stop_analyzer_8cs.html#a63c914dcb7d19365ff0f7c6ea7ef77c4"> 19</a></span>&#160;<span class="keyword">using</span> <a class="code" href="_arabic_analyzer_8cs.html#a63c914dcb7d19365ff0f7c6ea7ef77c4">Version</a> = Lucene.Net.Util.Version;</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="keyword">namespace </span>Lucene.Net.Analysis</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;{</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160; </div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; </div>
<div class="line"><a name="l00036"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html"> 36</a></span>&#160; <span class="keyword">public</span> sealed <span class="keyword">class </span><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a>:<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_analyzer.html" title="An Analyzer builds TokenStreams, which analyze text. It thus represents a policy for extracting index...">Analyzer</a></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; {</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; <span class="keyword">private</span> readonly ISet&lt;string&gt; stopWords;</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; <span class="keyword">private</span> readonly <span class="keywordtype">bool</span> enablePositionIncrements;</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;</div>
<div class="line"><a name="l00044"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a0025ccacf9cc663348b25d827d3a7473"> 44</a></span>&#160; <span class="keyword">public</span> <span class="keyword">static</span> ISet&lt;string&gt; <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a0025ccacf9cc663348b25d827d3a7473" title="An unmodifiable set containing some common English words that are not usually useful for searching...">ENGLISH_STOP_WORDS_SET</a>;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; </div>
<div class="line"><a name="l00047"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a540034d3fe0667805a5d102412c06cae"> 47</a></span>&#160; <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a>(<a class="code" href="_arabic_analyzer_8cs.html#a63c914dcb7d19365ff0f7c6ea7ef77c4">Version</a> matchVersion)</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; {</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; stopWords = ENGLISH_STOP_WORDS_SET;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; enablePositionIncrements = <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html" title="Removes stop words from a token stream.">StopFilter</a>.<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#ab11fb0a8f9564b60ae61e29bef912ca8" title="Returns version-dependent default for enablePositionIncrements. Analyzers that embed StopFilter use t...">GetEnablePositionIncrementsVersionDefault</a>(matchVersion);</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; }</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160;</div>
<div class="line"><a name="l00054"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a2ba9306f8b9be193007a36eafc79e6e6"> 54</a></span>&#160; <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a>(<a class="code" href="_arabic_analyzer_8cs.html#a63c914dcb7d19365ff0f7c6ea7ef77c4">Version</a> matchVersion, ISet&lt;string&gt; stopWords)</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; {</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; this.stopWords = stopWords;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; enablePositionIncrements = <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html" title="Removes stop words from a token stream.">StopFilter</a>.<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#ab11fb0a8f9564b60ae61e29bef912ca8" title="Returns version-dependent default for enablePositionIncrements. Analyzers that embed StopFilter use t...">GetEnablePositionIncrementsVersionDefault</a>(matchVersion);</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; }</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; </div>
<div class="line"><a name="l00069"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a43ba31a1f851f2c7d31c7325fbe3492b"> 69</a></span>&#160; <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a>(<a class="code" href="_arabic_analyzer_8cs.html#a63c914dcb7d19365ff0f7c6ea7ef77c4">Version</a> matchVersion, System.IO.FileInfo stopwordsFile)</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; {</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; stopWords = <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_wordlist_loader.html" title="Loader for text files that represent a list of stopwords.">WordlistLoader</a>.<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_wordlist_loader.html#a8c03d44044716caeb31ea634057f164f" title="Loads a text file and adds every line as an entry to a HashSet (omitting leading and trailing whitesp...">GetWordSet</a>(stopwordsFile);</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; enablePositionIncrements = <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html" title="Removes stop words from a token stream.">StopFilter</a>.<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#ab11fb0a8f9564b60ae61e29bef912ca8" title="Returns version-dependent default for enablePositionIncrements. Analyzers that embed StopFilter use t...">GetEnablePositionIncrementsVersionDefault</a>(matchVersion);</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; }</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;</div>
<div class="line"><a name="l00082"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a9980fe6ab0196fbe163bd1c07fc4cce8"> 82</a></span>&#160; <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a>(<a class="code" href="_arabic_analyzer_8cs.html#a63c914dcb7d19365ff0f7c6ea7ef77c4">Version</a> matchVersion, System.IO.TextReader stopwords)</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; {</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; stopWords = <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_wordlist_loader.html" title="Loader for text files that represent a list of stopwords.">WordlistLoader</a>.<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_wordlist_loader.html#a8c03d44044716caeb31ea634057f164f" title="Loads a text file and adds every line as an entry to a HashSet (omitting leading and trailing whitesp...">GetWordSet</a>(stopwords);</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; enablePositionIncrements = <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html" title="Removes stop words from a token stream.">StopFilter</a>.<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#ab11fb0a8f9564b60ae61e29bef912ca8" title="Returns version-dependent default for enablePositionIncrements. Analyzers that embed StopFilter use t...">GetEnablePositionIncrementsVersionDefault</a>(matchVersion);</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; }</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160;</div>
<div class="line"><a name="l00089"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a97a8240c8e4f19b8e74f598e1f35a7af"> 89</a></span>&#160; <span class="keyword">public</span> <span class="keyword">override</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_token_stream.html" title="A TokenStream enumerates the sequence of tokens, either from Fields of a Document or from query text...">TokenStream</a> <a class="code" href="_more_like_this_8cs.html#a205730fc8c2839cf92051d131140dae0">TokenStream</a>(System.String fieldName, System.IO.TextReader reader)</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; {</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html" title="Removes stop words from a token stream.">StopFilter</a>(enablePositionIncrements, <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_lower_case_tokenizer.html" title="LowerCaseTokenizer performs the function of LetterTokenizer and LowerCaseFilter together. It divides text at non-letters and converts them to lower case. While it is functionally equivalent to the combination of LetterTokenizer and LowerCaseFilter, there is a performance advantage to doing the two tasks at once, hence this (redundant) implementation. Note: this does a decent job for most European languages, but does a terrible job for some Asian languages, where words are not separated by spaces. ">LowerCaseTokenizer</a>(reader), stopWords);</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; }</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; </div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; <span class="keyword">private</span> <span class="keyword">class </span>SavedStreams</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; {</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; <span class="keyword">public</span> SavedStreams(<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a> enclosingInstance)</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; {</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; InitBlock(enclosingInstance);</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; }</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="keyword">private</span> <span class="keywordtype">void</span> InitBlock(StopAnalyzer enclosingInstance)</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; {</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; this.enclosingInstance = enclosingInstance;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; }</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; <span class="keyword">private</span> StopAnalyzer enclosingInstance;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <span class="keyword">public</span> StopAnalyzer Enclosing_Instance</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; {</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; <span class="keyword">get</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; {</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; <span class="keywordflow">return</span> enclosingInstance;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; }</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; </div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; }</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <span class="keyword">internal</span> <a class="code" href="_standard_tokenizer_8cs.html#a800fe4f39a3aa4f5ccac3b845d1edf23">Tokenizer</a> source;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; <span class="keyword">internal</span> <a class="code" href="_more_like_this_8cs.html#a205730fc8c2839cf92051d131140dae0">TokenStream</a> result;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; }</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; </div>
<div class="line"><a name="l00118"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a2621fcbc12118b1932a955c8d1545010"> 118</a></span>&#160; <span class="keyword">public</span> <span class="keyword">override</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_token_stream.html" title="A TokenStream enumerates the sequence of tokens, either from Fields of a Document or from query text...">TokenStream</a> ReusableTokenStream(System.String fieldName, System.IO.TextReader reader)</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; {</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; var streams = (SavedStreams) PreviousTokenStream;</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; <span class="keywordflow">if</span> (streams == null)</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; {</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; streams = <span class="keyword">new</span> SavedStreams(<span class="keyword">this</span>) {source = <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_lower_case_tokenizer.html" title="LowerCaseTokenizer performs the function of LetterTokenizer and LowerCaseFilter together. It divides text at non-letters and converts them to lower case. While it is functionally equivalent to the combination of LetterTokenizer and LowerCaseFilter, there is a performance advantage to doing the two tasks at once, hence this (redundant) implementation. Note: this does a decent job for most European languages, but does a terrible job for some Asian languages, where words are not separated by spaces. ">LowerCaseTokenizer</a>(reader)};</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; streams.result = <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html" title="Removes stop words from a token stream.">StopFilter</a>(enablePositionIncrements, streams.source, stopWords);</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; PreviousTokenStream = streams;</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; }</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; streams.source.Reset(reader);</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; <span class="keywordflow">return</span> streams.result;</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; }</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160; <span class="keyword">static</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a>()</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; {</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; {</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; var stopWords = <span class="keyword">new</span> System.String[]{<span class="stringliteral">&quot;a&quot;</span>, <span class="stringliteral">&quot;an&quot;</span>, <span class="stringliteral">&quot;and&quot;</span>, <span class="stringliteral">&quot;are&quot;</span>, <span class="stringliteral">&quot;as&quot;</span>, <span class="stringliteral">&quot;at&quot;</span>, <span class="stringliteral">&quot;be&quot;</span>, <span class="stringliteral">&quot;but&quot;</span>, <span class="stringliteral">&quot;by&quot;</span>, <span class="stringliteral">&quot;for&quot;</span>, <span class="stringliteral">&quot;if&quot;</span>, <span class="stringliteral">&quot;in&quot;</span>, <span class="stringliteral">&quot;into&quot;</span>, <span class="stringliteral">&quot;is&quot;</span>, <span class="stringliteral">&quot;it&quot;</span>, <span class="stringliteral">&quot;no&quot;</span>, <span class="stringliteral">&quot;not&quot;</span>, <span class="stringliteral">&quot;of&quot;</span>, <span class="stringliteral">&quot;on&quot;</span>, <span class="stringliteral">&quot;or&quot;</span>, <span class="stringliteral">&quot;such&quot;</span>, <span class="stringliteral">&quot;that&quot;</span>, <span class="stringliteral">&quot;the&quot;</span>, <span class="stringliteral">&quot;their&quot;</span>, <span class="stringliteral">&quot;then&quot;</span>, <span class="stringliteral">&quot;there&quot;</span>, <span class="stringliteral">&quot;these&quot;</span>, <span class="stringliteral">&quot;they&quot;</span>, <span class="stringliteral">&quot;this&quot;</span>, <span class="stringliteral">&quot;to&quot;</span>, <span class="stringliteral">&quot;was&quot;</span>, <span class="stringliteral">&quot;will&quot;</span>, <span class="stringliteral">&quot;with&quot;</span>};</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160; var stopSet = <span class="keyword">new</span> CharArraySet(stopWords.Length, <span class="keyword">false</span>);</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; stopSet.AddAll(stopWords);</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; ENGLISH_STOP_WORDS_SET = CharArraySet.UnmodifiableSet(stopSet);</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160; }</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; }</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; }</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160;}</div>
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