> For the complete documentation index, see [llms.txt](https://docs.icpc1hn.work/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.icpc1hn.work/2.-huong-dan-du-dung-app-icpc1hn/cuoc-hen-check-call/check-call-nhanh.md).

# Check call nhanh

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