By the way, has anyone else had this problem: you're on floor 10, say, and you want to get to floor 15, say, so you run up 5 flights of stairs and try to find the room but then after a while you realise that somehow you've ended up on floor 16 so you think you're going demented and can't count but after this has happened a few times you realise ... THE IDIOTS HAVE OMITTED FLOOR 13!
If there's one thing worse than 1-based indexing it's leaving-out-13-based indexing ... Has any programming language tried doing that with arrays, I wonder?
