> For the complete documentation index, see [llms.txt](https://wiki.kabala.vn/hdsd/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.kabala.vn/hdsd/thu-ngo.md).

# Thư ngỏ

<figure><img src="https://3319925233-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FswFtom41DEptU12Lqvmr%2Fuploads%2FUfnn6VQU2zXGxNtsCqLh%2F1280X1280.PNG?alt=media&amp;token=aa191d7d-873f-43ad-beab-cd1f895f7e8a" alt=""><figcaption></figcaption></figure>