Only those who are highly skilled in fishing can join the fishing association; all people in the fishing association wear sun hats; some retired veterans are members of the fishing association; no one in a certain street can fish. Which one cannot be confirmed from this? ['Some retired comrades wear sun hats.', 'No one on this street is a member of the Fishing Association.', 'Some people on the street wear sun hats.', 'Some retired old comrades have superb fishing skills.']