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<details>
  <summary>사내 공지사항</summary>
  <ul>
    <li>1. 공지사항 1번입니다.</li>
    <li>2. 공지사항 2번입니다.</li>
    <li>3. 공지사항 3번입니다.</li>
  </ul>
</details>

<details>
  <summary>사내 최고봉</summary>
  <div>사장님</div>
</details>

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