All this was very loose guessing, and I don't pretend it was ingenious or scientific. I wasn't any kind of Sherlock Holmes. But I have always fancied I had a kind of instinct about questions like this. I don't know if I can explain myself, but I used to use my brains as far as they went, and after they came to a blank wall I guessed, and I usually found my guesses pretty right.
So I set out all my conclusions on a bit of Admiralty paper. They ran like this:
FAIRLY CERTAIN
(1) Place where there are several sets of stairs; one that matters distinguished by having thirty-nine steps.