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Ban fai doc ky xem dau can cua ban gui ma ascii phai ko. Neu gui ma ascii thi ban phai thiet lap vb nhan ma sacii luon moi dc. Trong doan code minh thay ban thiet lap no la nhi phan nen no chi hieu dc "kg" thoi.
Dau can minh giao tiep nhieu roi no cung don gian ko kho dau.
Than.
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