Five graduate students majoring in linguistics in the liberal arts college of a university in 2014, Zhang, Wang, Li, Zhao and Liu, were hired by one of the three employers Tianshu, Tianji and Tianxuan, and each unit hired at least one of them
It is known that: (1) Li was hired by Tianshu; (2) Li and Zhao were not employed by the same unit; (3) Liu and Zhao were hired by the same unit; (4) if Zhang was hired by Tianxuan, Wang was also hired by Tianxuan
Wang, Zhao and Liu were all hired by Tianji