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ban phai noi ro yeu cau ra chu, chi can dieu khien con dong co chay trai phai roi hien thi hay la hien thi ca toc do nua, luu y voi ban la ban phai dieu khien dong co qua role ko thi xu lu nhieu met lam, minh su dung ngon ngu baíc ban co the dua yeu cau len rui minh lap trinh thu xem minh cung dang lam mach dieu khien 4 con dong co hien nay da chay tam tam roi!!
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