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https://viethip.com/2018/07/18/vietnamese-lam-the-nao-de-viet-phan-mem-diet-vi-rut-buoc-1quet-file-bang-ma-hash/
[Vietnamese] Làm thế nào để viết phần mềm diệt vi-rút - B.1 Quét file bằng mã hash