(setq *print-circle* t)

(setq *room* '#1=(CURRENT (LIVING-ROOM LAMP)
                 (LADDER (ATTIC APPLE ORANGE) #1#)
                 (DOOR (GARDEN) #1#)))
(print *room*)

(defvar *vowels* '(#\a #\e #\i #\o #\u))

(defun look ()
(let ((string-location (format nil "~(~a~)" (caadr *room*)))
      (exits (mapcar 'car (cddr *room*)))
      (items (cdadr *room*)))
 (format t "I am in a~@[n~1*~] ~a~%"
        (find (char string-location 0) *vowels*)
        string-location)
 (format t "~[No items~;One item: ~:;Items: ~] ~@[~a~]~%"
        (length items) items)
 (format t "Exits to: ~a~%" exits)))

(defun traverse (edge)
(let ((destination (assoc edge (cddr *room*))))
 (cond (destination
        (rplaca *room* edge)
        (setq *room* destination)
        (rplaca *room* 'current))
       ((null destination)
        (format t "~a not found~%" edge))))
(look))

(defvar *inventories* '((1 . ())))

(defun take (item-name &optional (player 1))
(symbol-macrolet
       ((inventory (cdr (assoc player *inventories*)))
        (room-contents (cdadr *room*)))
 (let ((item (find item-name room-contents)))
  (if (not item) (format t "I can't take ~a~%" item-name)
   (unwind-protect (push item inventory)
    (setf room-contents (delete item room-contents)))))))

(defun taken (&optional (player 1))
(cdr (assoc player *inventories*)))

(defun untake (item-name &optional (player 1))
(symbol-macrolet
       ((inventory (cdr (assoc player *inventories*)))
        (room-contents (cdadr *room*)))
 (if (find item-name inventory)
  (unwind-protect (push item-name room-contents)
   (setf inventory (delete item-name inventory)))
  (format t "I can't drop ~a~%" item-name))))

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