(let ((ucs #xE000)
      big5 chr
      ret)
  (while (<= ucs #xF848)
    (setq chr (decode-char 'ucs ucs))
    (when (setq big5 (get-char-attribute chr 'chinese-big5-pua))
      (when (setq chr (decode-char 'chinese-big5-cdp big5))
	(unless (get-char-attribute chr 'chinese-big5-cdp)
	  (put-char-attribute chr 'chinese-big5-cdp big5))))
    (setq ucs (1+ ucs))))

;; (map-char-attribute
;;  (lambda (ch v)
;;    (if (and ch
;;             (get-char-attribute ch 'chinese-big5))
;;        (remove-char-attribute ch 'chinese-big5))
;;    nil)
;;  'chinese-big5-cdp)