Yes, you're right this is obvious. But you're missing the whole point. And here it is:
That was what I tried to explain by the post which I gave the case determining questions in, I just was a little bit confusing, I agree with you. Perhaps, I should've answered like that in that post... However, I just think that sometimes it would be better to nudge someone towards the solution rather than just giving it right to them. And Valda's quick and steady improvement is a tribute to her sharp mind, so I let myself do that kind of nudging