A college will continue to implement the overseas funding plan this year  It plans to select several of the six teachers from Mr  Liu, Mr  Zhang, Mr  Wang, Mr  Ma, Mr  Niu and Mr  Zhou to visit abroad  Due to the limitations of funding, the needs of discipline development, curriculum arrangement, place and time of each student's visit, the selection shall meet the following conditions: (1) Mr  Liu is the reserve discipline leader of the college, This time we have to send out  (2) if we choose Mr  Liu, we should also choose Mr  Zhou, but we can't choose Mr  Zhang  (3) only if Mr  Niu can't choose, at least one of Mr  Wang and Mr  Ma can choose  (4) if we don't choose Mr  Wang, we don't choose Mr
Mr. Niu didn't choose, but Mr. Zhou did
 Zhou either