Three Chinese students, Zhang Lin, Zhao Qiang, and Li Shan, and three foreign students, John, Jessie, and Anna, went on a summer vacation  The optional tourist destinations are Xi'an, Hangzhou, Dalian and Zhangjiajie  Already know: (1) each person can only go to one place  (2) wherever there are Chinese students, there must be foreign students  (3) wherever there are foreign students, there must be Chinese students
Li Shan and Anna
 (4) John went to Xi'an or Hangzhou, and Zhao Qiang went to Zhangjiajie