9. Use Multiple Dispatch

(defmethod save ((p position) (stream file-stream))

. . . )

(defmethod save ((a aircraft) (stream file-stream))

. . . )

(defmethod save ((p position) (stream database))

. . . )

(defmethod save ((a aircraft) (stream database))

. . . )

;; The applicable method(s) depends on

;; multiple arguments.

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