human
Here you are, blocking the corridor at Number Four ; he made a mark on the plan at that point.
gpt
By the way, are there any other exits from the banquet room except these two corridor doors?
human
No, sir.
gpt
Good! Now pay attention. While you were listening at this door--I'll mark it _A_--with your back turned to Number Six, a person _might_ have left the banquet room by the farther door--I'll mark it _B_--and stepped across the corridor into Number Six without your seeing him. Isn't that true?
human
Yes, sir, it's possible.
gpt
Or a person might have gone into Number Six from either Number Five or Number Seven without your seeing him?