[Circle] Bitvector Explanation please

From: DJ Pure (pure@ozramp.net.au)
Date: 11/28/96

G'Day All,
	  i've read the docs, but i'm still unfamiliar with bitvectors and what
they do. i know how to impleement them, but I'm not sure how to use them in
the game.
For example. I had this
#define open 0
#define closed 1
#define locked 2
#define pickproof 3
#define secret_closed 4
#define secret_locked 5
#define secret_pickproof 6

and i was told i don't nned 5 and 6 cause 4 already 'encompasses' them.
This is why I'm confussed, so can someone quickly explain them please

Thanks as always.

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