- Notes from 11/8/02

- besides enviroment, there is also state

- set-car!
	- sets the car of something to something else
	- (set-car! (cdr x) blah) will change x as well
- set-cdr!
	- same idea with cdr
	- can extend the list by setting to a longer cdr

- (cons x y)
	- creates a pair of new variables
	- if (define z (cons x y)) then you can call them (car z) (cdr z)
	- evaluated twice you get two different pairs
	- set-car!, set-cdr! could assign to these new variables

- set-cdr! (cdr x) x
	- weird!
	- nifty loop structure