A tour group went to the Mulan paddock for a trip  The group members rode horses, shot arrows, ate barbecued meat, and finally went to the store to buy souvenirs  Known: (1) Someone bought a Mongolian knife  (2) Someone did not buy a Mongolian knife  (3) Both Mr  Zhang and Ms
Wang from the group bought Mongolian knives
Both Mr. Zhang and Ms. Wang bought Mongolian knives.