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| ANSI Common Lisp 14 Conses 14.2 Dictionary of Conses
14.2.35 acons | Function
  Syntax: acons key datum alist new-alist Arguments and Values: key - an object. datum - an object. alist - an association list. new-alist - an association list. Description: Creates a fresh cons, the cdr of which is alist and the car of which is another fresh cons, the car of which is key and the cdr of which is datum. Examples:
       (setq alist '())   NIL
       (acons 1 "one" alist)  ((1 . "one"))
       alist   NIL
       (setq alist (acons 1 "one" (acons 2 "two" alist)))  ((1 . "one") (2 . "two"))
       (assoc 1 alist)  (1 . "one")
       (setq alist (acons 1 "uno" alist))  ((1 . "uno") (1 . "one") (2 . "two"))
       (assoc 1 alist)  (1 . "uno")
  See Also: assoc, pairlis Notes:
      (acons key datum alist) ==(cons (cons key datum) alist)
Allegro CL Implementation Details: None.

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