Complex classes like ArticleAttribute often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use ArticleAttribute, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 15 | class ArticleAttribute extends Base  | 
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| 16 | { | 
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| 17 | /**  | 
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| 18 | * @var mixed  | 
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| 19 | */  | 
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| 20 | protected $attr1;  | 
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| 21 | /**  | 
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| 22 | * @var mixed  | 
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| 23 | */  | 
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| 24 | protected $attr2;  | 
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| 25 | /**  | 
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| 26 | * @var mixed  | 
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| 27 | */  | 
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| 28 | protected $attr3;  | 
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| 29 | /**  | 
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| 30 | * @var mixed  | 
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| 31 | */  | 
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| 32 | protected $attr4;  | 
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| 33 | /**  | 
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| 34 | * @var mixed  | 
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| 35 | */  | 
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| 36 | protected $attr5;  | 
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| 37 | /**  | 
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| 38 | * @var mixed  | 
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| 39 | */  | 
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| 40 | protected $attr6;  | 
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| 41 | /**  | 
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| 42 | * @var mixed  | 
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| 43 | */  | 
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| 44 | protected $attr7;  | 
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| 45 | /**  | 
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| 46 | * @var mixed  | 
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| 47 | */  | 
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| 48 | protected $attr8;  | 
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| 49 | /**  | 
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| 50 | * @var mixed  | 
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| 51 | */  | 
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| 52 | protected $attr9;  | 
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| 53 | /**  | 
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| 54 | * @var mixed  | 
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| 55 | */  | 
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| 56 | protected $attr10;  | 
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| 57 | /**  | 
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| 58 | * @var mixed  | 
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| 59 | */  | 
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| 60 | protected $attr11;  | 
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| 61 | /**  | 
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| 62 | * @var mixed  | 
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| 63 | */  | 
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| 64 | protected $attr12;  | 
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| 65 | /**  | 
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| 66 | * @var mixed  | 
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| 67 | */  | 
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| 68 | protected $attr13;  | 
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| 69 | /**  | 
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| 70 | * @var mixed  | 
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| 71 | */  | 
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| 72 | protected $attr14;  | 
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| 73 | /**  | 
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| 74 | * @var mixed  | 
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| 75 | */  | 
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| 76 | protected $attr15;  | 
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| 77 | /**  | 
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| 78 | * @var mixed  | 
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| 79 | */  | 
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| 80 | protected $attr16;  | 
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| 81 | /**  | 
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| 82 | * @var mixed  | 
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| 83 | */  | 
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| 84 | protected $attr17;  | 
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| 85 | /**  | 
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| 86 | * @var mixed  | 
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| 87 | */  | 
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| 88 | protected $attr18;  | 
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| 89 | /**  | 
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| 90 | * @var mixed  | 
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| 91 | */  | 
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| 92 | protected $attr19;  | 
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| 93 | /**  | 
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| 94 | * @var mixed  | 
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| 95 | */  | 
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| 96 | protected $attr20;  | 
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| 97 | /**  | 
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| 98 | * @var int  | 
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| 99 | */  | 
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| 100 | protected $articleId;  | 
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| 101 | /**  | 
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| 102 | * @var int  | 
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| 103 | */  | 
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| 104 | protected $articleDetailId;  | 
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| 105 | |||
| 106 | /**  | 
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| 107 | * @return mixed  | 
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| 108 | */  | 
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| 109 | public function getAttr1()  | 
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| 113 | |||
| 114 | /**  | 
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| 115 | * @param mixed $attr1  | 
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| 116 | *  | 
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| 117 | * @return ArticleAttribute  | 
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| 118 | */  | 
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| 119 | public function setAttr1($attr1)  | 
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| 125 | |||
| 126 | /**  | 
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| 127 | * @return mixed  | 
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| 128 | */  | 
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| 129 | public function getAttr2()  | 
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| 133 | |||
| 134 | /**  | 
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| 135 | * @param mixed $attr2  | 
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| 136 | *  | 
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| 137 | * @return ArticleAttribute  | 
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| 138 | */  | 
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| 139 | public function setAttr2($attr2)  | 
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| 145 | |||
| 146 | /**  | 
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| 147 | * @return mixed  | 
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| 148 | */  | 
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| 149 | public function getAttr3()  | 
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| 153 | |||
| 154 | /**  | 
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| 155 | * @param mixed $attr3  | 
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| 156 | *  | 
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| 157 | * @return ArticleAttribute  | 
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| 158 | */  | 
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| 159 | public function setAttr3($attr3)  | 
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| 165 | |||
| 166 | /**  | 
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| 167 | * @return mixed  | 
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| 168 | */  | 
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| 169 | public function getAttr4()  | 
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| 173 | |||
| 174 | /**  | 
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| 175 | * @param mixed $attr4  | 
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| 176 | *  | 
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| 177 | * @return ArticleAttribute  | 
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| 178 | */  | 
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| 179 | public function setAttr4($attr4)  | 
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| 185 | |||
| 186 | /**  | 
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| 187 | * @return mixed  | 
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| 188 | */  | 
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| 189 | public function getAttr5()  | 
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| 193 | |||
| 194 | /**  | 
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| 195 | * @param mixed $attr5  | 
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| 196 | *  | 
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| 197 | * @return ArticleAttribute  | 
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| 198 | */  | 
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| 199 | public function setAttr5($attr5)  | 
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| 205 | |||
| 206 | /**  | 
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| 207 | * @return mixed  | 
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| 208 | */  | 
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| 209 | public function getAttr6()  | 
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| 213 | |||
| 214 | /**  | 
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| 215 | * @param mixed $attr6  | 
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| 216 | *  | 
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| 217 | * @return ArticleAttribute  | 
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| 218 | */  | 
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| 219 | public function setAttr6($attr6)  | 
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| 225 | |||
| 226 | /**  | 
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| 227 | * @return mixed  | 
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| 228 | */  | 
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| 229 | public function getAttr7()  | 
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| 233 | |||
| 234 | /**  | 
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| 235 | * @param mixed $attr7  | 
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| 236 | *  | 
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| 237 | * @return ArticleAttribute  | 
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| 238 | */  | 
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| 239 | public function setAttr7($attr7)  | 
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| 245 | |||
| 246 | /**  | 
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| 247 | * @return mixed  | 
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| 248 | */  | 
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| 249 | public function getAttr8()  | 
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| 253 | |||
| 254 | /**  | 
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| 255 | * @param mixed $attr8  | 
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| 256 | *  | 
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| 257 | * @return ArticleAttribute  | 
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| 258 | */  | 
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| 259 | public function setAttr8($attr8)  | 
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| 265 | |||
| 266 | /**  | 
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| 267 | * @return mixed  | 
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| 268 | */  | 
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| 269 | public function getAttr9()  | 
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| 273 | |||
| 274 | /**  | 
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| 275 | * @param mixed $attr9  | 
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| 276 | *  | 
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| 277 | * @return ArticleAttribute  | 
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| 278 | */  | 
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| 279 | public function setAttr9($attr9)  | 
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| 285 | |||
| 286 | /**  | 
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| 287 | * @return mixed  | 
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| 288 | */  | 
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| 289 | public function getAttr10()  | 
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| 293 | |||
| 294 | /**  | 
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| 295 | * @param mixed $attr10  | 
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| 296 | *  | 
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| 297 | * @return ArticleAttribute  | 
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| 298 | */  | 
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| 299 | public function setAttr10($attr10)  | 
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| 305 | |||
| 306 | /**  | 
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| 307 | * @return mixed  | 
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| 308 | */  | 
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| 309 | public function getAttr11()  | 
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| 313 | |||
| 314 | /**  | 
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| 315 | * @param mixed $attr11  | 
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| 316 | *  | 
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| 317 | * @return ArticleAttribute  | 
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| 318 | */  | 
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| 319 | public function setAttr11($attr11)  | 
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| 325 | |||
| 326 | /**  | 
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| 327 | * @return mixed  | 
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| 328 | */  | 
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| 329 | public function getAttr12()  | 
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| 333 | |||
| 334 | /**  | 
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| 335 | * @param mixed $attr12  | 
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| 336 | *  | 
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| 337 | * @return ArticleAttribute  | 
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| 338 | */  | 
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| 339 | public function setAttr12($attr12)  | 
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| 345 | |||
| 346 | /**  | 
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| 347 | * @return mixed  | 
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| 348 | */  | 
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| 349 | public function getAttr13()  | 
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| 353 | |||
| 354 | /**  | 
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| 355 | * @param mixed $attr13  | 
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| 356 | *  | 
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| 357 | * @return ArticleAttribute  | 
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| 358 | */  | 
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| 359 | public function setAttr13($attr13)  | 
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| 365 | |||
| 366 | /**  | 
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| 367 | * @return mixed  | 
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| 368 | */  | 
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| 369 | public function getAttr14()  | 
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| 373 | |||
| 374 | /**  | 
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| 375 | * @param mixed $attr14  | 
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| 376 | *  | 
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| 377 | * @return ArticleAttribute  | 
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| 378 | */  | 
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| 379 | public function setAttr14($attr14)  | 
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| 385 | |||
| 386 | /**  | 
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| 387 | * @return mixed  | 
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| 388 | */  | 
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| 389 | public function getAttr15()  | 
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| 393 | |||
| 394 | /**  | 
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| 395 | * @param mixed $attr15  | 
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| 396 | *  | 
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| 397 | * @return ArticleAttribute  | 
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| 398 | */  | 
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| 399 | public function setAttr15($attr15)  | 
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| 405 | |||
| 406 | /**  | 
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| 407 | * @return mixed  | 
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| 408 | */  | 
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| 409 | public function getAttr16()  | 
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| 413 | |||
| 414 | /**  | 
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| 415 | * @param mixed $attr16  | 
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| 416 | *  | 
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| 417 | * @return ArticleAttribute  | 
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| 418 | */  | 
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| 419 | public function setAttr16($attr16)  | 
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| 425 | |||
| 426 | /**  | 
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| 427 | * @return mixed  | 
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| 428 | */  | 
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| 429 | public function getAttr17()  | 
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| 433 | |||
| 434 | /**  | 
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| 435 | * @param mixed $attr17  | 
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| 436 | *  | 
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| 437 | * @return ArticleAttribute  | 
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| 438 | */  | 
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| 439 | public function setAttr17($attr17)  | 
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| 445 | |||
| 446 | /**  | 
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| 447 | * @return mixed  | 
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| 448 | */  | 
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| 449 | public function getAttr18()  | 
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| 453 | |||
| 454 | /**  | 
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| 455 | * @param mixed $attr18  | 
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| 456 | *  | 
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| 457 | * @return ArticleAttribute  | 
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| 458 | */  | 
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| 459 | public function setAttr18($attr18)  | 
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| 465 | |||
| 466 | /**  | 
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| 467 | * @return mixed  | 
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| 468 | */  | 
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| 469 | public function getAttr19()  | 
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| 473 | |||
| 474 | /**  | 
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| 475 | * @param mixed $attr19  | 
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| 476 | *  | 
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| 477 | * @return ArticleAttribute  | 
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| 478 | */  | 
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| 479 | public function setAttr19($attr19)  | 
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| 485 | |||
| 486 | /**  | 
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| 487 | * @return mixed  | 
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| 488 | */  | 
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| 489 | public function getAttr20()  | 
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| 493 | |||
| 494 | /**  | 
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| 495 | * @param mixed $attr20  | 
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| 496 | *  | 
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| 497 | * @return ArticleAttribute  | 
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| 498 | */  | 
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| 499 | public function setAttr20($attr20)  | 
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| 505 | |||
| 506 | /**  | 
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| 507 | * @return int  | 
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| 508 | */  | 
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| 509 | public function getArticleId()  | 
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| 513 | |||
| 514 | /**  | 
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| 515 | * @param int $articleId  | 
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| 516 | *  | 
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| 517 | * @return ArticleAttribute  | 
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| 518 | */  | 
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| 519 | public function setArticleId($articleId)  | 
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| 525 | |||
| 526 | /**  | 
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| 527 | * @return int  | 
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| 528 | */  | 
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| 529 | public function getArticleDetailId()  | 
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| 533 | |||
| 534 | /**  | 
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| 535 | * @param int $articleDetailId  | 
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| 536 | *  | 
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| 537 | * @return ArticleAttribute  | 
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| 538 | */  | 
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| 539 | public function setArticleDetailId($articleDetailId)  | 
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| 545 | }  | 
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| 546 |