Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_map_module.xml @ 572:17ceffcc7ffb
Brought the ngx_http_map_module documentation up to date.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Thu, 05 Jul 2012 13:15:08 +0000 |
parents | 9913f1d51c07 |
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rev | line source |
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1 <?xml version="1.0"?> |
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2 |
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3 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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4 |
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5 <module name="Module ngx_http_map_module" |
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6 link="/en/docs/http/ngx_http_map_module.html" |
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7 lang="en"> |
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8 |
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9 <section id="summary"> |
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10 |
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11 <para> |
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12 The <literal>ngx_http_map_module</literal> module creates variables |
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13 whose values depend on values of other variables. |
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14 </para> |
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15 |
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16 </section> |
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17 |
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18 |
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19 <section id="example" name="Example Configuration"> |
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20 |
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21 <para> |
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22 <example> |
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23 map $http_host $name { |
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24 hostnames; |
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25 |
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26 default 0; |
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27 |
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28 example.com 1; |
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29 *.example.com 1; |
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30 example.org 2; |
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31 *.example.org 2; |
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32 .example.net 3; |
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33 wap.* 4; |
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34 } |
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35 |
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36 map $http_user_agent $mobile { |
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37 default 0; |
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38 "~Opera Mini" 1; |
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39 } |
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40 </example> |
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41 </para> |
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42 |
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43 </section> |
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44 |
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45 |
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46 <section id="directives" name="Directives"> |
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47 |
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48 <directive name="map"> |
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49 <syntax block="yes"> |
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50 <value>string</value> |
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51 <value>$variable</value></syntax> |
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52 <default/> |
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53 <context>http</context> |
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54 |
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55 <para> |
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56 Creates a new variable whose value |
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57 depends on values of one or more of the source variables |
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58 specified in the first parameter. |
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59 <note> |
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60 Before version 0.9.0 only a single variable could be |
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61 specified in the first parameter. |
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62 </note> |
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63 </para> |
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64 |
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65 <para> |
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66 Parameters inside the <literal>map</literal> block specify a mapping |
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67 between source and resulting values. |
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68 </para> |
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69 |
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70 <para> |
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71 Source values are specified as strings or regular expressions (0.9.6). |
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72 </para> |
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73 |
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74 <para> |
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75 A regular expression should either start from the “<literal>~</literal>” |
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76 symbol for a case-sensitive matching, or from the “<literal>~*</literal>” |
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77 symbols (1.0.4) for case-insensitive matching. |
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78 A regular expression can contain named and positional captures |
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79 that can later be used in other directives along with the |
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80 resulting variable. |
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81 </para> |
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82 |
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83 <para> |
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84 If a source value matches one of the names of special parameters |
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85 (see below), it should be prefixed with the “<literal>\</literal>” symbol. |
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86 </para> |
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87 |
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88 <para> |
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89 The resulting value can be a string |
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90 or another variable (0.9.0). |
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91 </para> |
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92 |
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93 <para> |
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94 The directive also supports three special parameters: |
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95 <list type="tag"> |
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96 <tag-name><literal>default</literal> <value>value</value></tag-name> |
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97 <tag-desc> |
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98 sets the resulting value if the source value matches none |
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99 of the specified variants. |
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100 When <literal>default</literal> is not specified, the default |
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101 resulting value will be an empty string. |
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102 </tag-desc> |
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103 |
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104 <tag-name><literal>hostnames</literal></tag-name> |
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105 <tag-desc> |
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106 allows to specify hostnames with a prefix or suffix mask, as source |
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107 values, for example, |
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108 <example> |
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109 *.example.com 1; |
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110 example.* 1; |
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111 </example> |
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112 The following two records |
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113 <example> |
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114 example.com 1; |
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115 *.example.com 1; |
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116 </example> |
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117 can be combined: |
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118 <example> |
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119 .example.com 1; |
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120 </example> |
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121 This parameter should be specified before the list of values. |
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122 </tag-desc> |
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123 |
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124 <tag-name><literal>include</literal> <value>file</value></tag-name> |
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125 <tag-desc> |
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126 includes a file with values. |
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127 There can be several inclusions. |
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128 </tag-desc> |
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129 |
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130 </list> |
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131 </para> |
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132 |
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133 <para> |
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134 If the source value matches more than one of the specified variants, |
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135 e.g. both mask and regular expression match, the first matching |
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136 variant will be choosen, in the following order of precedence: |
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137 <list type="enum"> |
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138 |
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139 <listitem> |
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140 string value without a mask |
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141 </listitem> |
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142 |
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143 <listitem> |
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144 longest string value with a prefix mask, |
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145 e.g. “<literal>*.example.com</literal>” |
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146 </listitem> |
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147 |
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148 <listitem> |
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149 longest string value with a suffix mask, |
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150 e.g. “<literal>mail.*</literal>” |
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151 </listitem> |
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152 |
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153 <listitem> |
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154 first matching regular expression |
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155 (in order of appearance in a configuration file) |
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156 </listitem> |
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157 |
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158 <listitem> |
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159 default value |
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160 </listitem> |
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161 |
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162 </list> |
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163 </para> |
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164 |
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165 </directive> |
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166 |
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167 |
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168 <directive name="map_hash_bucket_size"> |
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169 <syntax><value>size</value></syntax> |
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170 <default>32|64|128</default> |
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171 <context>http</context> |
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172 |
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173 <para> |
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174 Sets the bucket size for the <link id="map"/> variables hash tables. |
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175 Default value depends on the size of the processor's cache line. |
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176 For more information, please refer to |
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177 <link doc="../hash.xml">Setting Up Hashes</link>. |
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178 </para> |
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179 |
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180 </directive> |
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181 |
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182 |
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183 <directive name="map_hash_max_size"> |
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184 <syntax><value>size</value></syntax> |
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185 <default>2048</default> |
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186 <context>http</context> |
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187 |
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188 <para> |
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189 Sets the maximum <value>size</value> of the <link id="map"/> variables |
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190 hash tables. |
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191 For more information, please refer to |
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192 <link doc="../hash.xml">Setting Up Hashes</link>. |
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193 </para> |
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194 |
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195 </directive> |
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196 |
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197 </section> |
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198 |
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199 </module> |