How do I get out of the catacombs?

Hint 1 of 5:

They're hard to map, since they change from game to game.

Hint 2 of 5:

I think it works like this. The first time you go through the catacombs, any
sequence of eighteen moves will get you back to 'Y2?'. That sequence
determines the layout of the catacombs.

Hint 3 of 5:

When you reenter, you have to move the same way, or you end up kind of going
backward. If you like, you can play around with dropping objects and see what
I mean.

Hint 4 of 5:

I usually just go straight west the first time.