text: By noon on May 20, authorities traced 79 F1s at the company involving many districts, towns and cities in the province?
classes:  No, bac Giang added 2 cases arising in the centralized quarantine zone.  Besides, bac Giang added 2 cases arising in the centralized quarantine zone.  Yes, bac Giang added 2 cases arising in the centralized quarantine zone.  Meanwhile, bac Giang added 2 cases arising in the centralized quarantine zone.