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实例 2 > 样例 1

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实例
 
//BBB
选择所有BBB元素

     <AAA>
          <BBB/>
          <CCC/>
          <BBB/>
          <DDD>
               <BBB/>
          </DDD>
          <CCC>
               <DDD>
                    <BBB/>
                    <BBB/>
               </DDD>
          </CCC>
     </AAA>
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