EPL Exercise 1.2.1

> (define x '(a b ((3) c) d))
> (car (cdr x))
b
> (caddr x)
((3) c)
> (cdaddr x)
(c)
> (char? (car '(#\a #\b)))
#t
> (cons 'x x)
(x a b ((3) c) d)
> (cons (list 1 2) (cons 3 '(4)))
((1 2) 3 4)
> (cons (list) (list 1 (cons 2 '())))
(() 1 (2))