el.el

(cons 1 (cons 2 (cons 3 (cons 5 ()))))	; => (1 2 3 5)
(list 1 2 3 5)				; => (1 2 3 5)
(quote (1 2 3 5))			; => (1 2 3 5)
'(1 2 3 5)				; => (1 2 3 5)

(set 'a '(1 2 3 5))			; => (1 2 3 5)
(setq a '(1 2 3 5))			; => (1 2 3 5)

(let ((a '(1 2 3 5)))
  (while a
    a					; => (1 2 3 5), (2 3 5), (3 5), (5)
    (insert (format "\n;; >> %d" (car a)))
    (setq a (cdr a))))
;; >> 1
;; >> 2
;; >> 3
;; >> 5

(mapcar (lambda (i) (insert (format "\n;; >> %d" i))) a)
;; >> 1
;; >> 2
;; >> 3
;; >> 5

a					; => (1 2 3 5)


'("matz" . 54)				; => ("matz" . 54)
'(("matz" . 54) ("dhh" . 40))		; => (("matz" . 54) ("dhh" . 40))

(setq h '(("matz" . 54) ("dhh" . 40)))
(assoc "matz" h)			; => ("matz" . 54)
(cdr (assoc "matz" h))			; => 54
(assoc-default "matz" h)		; => 54
(assoc "linda" h)			; => nil
(or (assoc-default "linda" h) 0)	; => 0

(setq h '((:matz . 54) (:dhh . 40)))
(assq :matz h)				; => (:matz . 54)
(cdr (assq :matz h))			; => 54
(or (cdr (assq :linda h)) 0)		; => 0