title: Delete duplicate multiple lines using vscode
body: <p>i have so many line just like this json code (120000 lines)</p>
  
  <pre><code>{
  "name":"V83.9",
  "name":"Work",
  "name":"V83.9",
  "name":"Education",
  "name":"V83.9",
  "name":"Profession"
  }
  </code></pre>
  
  <p>and i want this convert just like this </p>
  
  <pre><code>{
  "name":"V83.9",
  "name":"Work",
  "name":"Education",
  "name":"Profession"
  }
  </code></pre>
  
  <p>and i wrote regex on vscode just like this but this is not working</p>
  
  <p>Find: <code>{\n"name":"$1",\n"name":"$2",\n"name":"$1",\n"name":"$3",\n"name":"$1",\n"name":"$4"\n}</code></p>
  
  <p>Replace: <code>{\n"name":"$1",\n"name":"$2",\n"name":"$3",\n"name":"$4"\n}</code></p>
  
  <p>How do i do this?</p>