A teaching and research office will select some teachers to attend an international academic seminar
According to the work schedule, the following conditions must be met: (1) if teacher Zhao or teacher Qian goes, then teacher Sun should also go; (2) the Zong director in charge of scientific research must go; (3) if teacher Qian does not go, then teacher Li goes, but teacher Zhou can not go; (4) if the Zong director goes, then teacher Zhou should also go
Teacher Qian should go, Teacher Sun should not go.