The Reception Department of an office receives three visitors a day: Lao Zhao, Lao Qian and Lao Sun  After the meeting, three comrades found that the undergraduate section chief, Deputy Section Chief and staff three surnames just the same as the three visitors  In addition, there are the following situations: (1) the home of the old visitor Qian in Wuxi  (2)Visitor Lao Zhao is a veteran worker with 28 years of service  (3)The deputy section chief lives somewhere between Nanjing and Wuxi  (4) a fellow scientist and a colleague surnamed Sun turned out to be primary school classmates  (5)One of the visitors was a neighbor of the deputy section chief, who was also an old worker and had exactly three times the length of service of the section chief
(6) the same surname as the deputy section chief visited Hakka people and lived in Nanjing
Section chief surnames Qian, Deputy Section Chief Surnames Sun, section member surnames Zhao.