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prefix arg in (interactive (list )) form

From: Jambunathan K
Subject: prefix arg in (interactive (list )) form
Date: Sat, 04 Jun 2011 09:28:52 +0530
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (windows-nt) 
How do I get prefix arg in the code down below?

(defun org-export-as (backend arg)
  ;; (interactive "Mbackend: \nP") <====== original
  (interactive
   (list (ido-completing-read
          "Export to: " org-export-other-backends-alist nil t nil)
         nil))  ; <===== equivalent. How do I get prefix arg here

  ;; etc etc etc
  )


TIA,
Jambunathan K.

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