There are three staff members in an office: Liu Ming, Zhuang Yan and Wen Hu. Among them, one is a doctor, one is a master, and one is an undergraduate graduate. It is known that the doctor is two years older than Liu Ming; Zhuang Yan is the same age as the undergraduate, but the month is a little older; Undergraduate graduates are the youngest.
Which of the followings can be infered
Liu Ming is a master, Zhuang Yan is a doctor and Wen Hu is a graduate