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[racket] How to set! via name of symbol

From: Roman Klochkov (kalimehtar at mail.ru)
Date: Tue Jul 22 00:41:12 EDT 2014		 
 In Common Lisp one can do
(defvar a 1)
(defvar b 'a)

(set b 2)
(print a) ;; prints 2

Is it possible in Racket. I mean
(define a 1)
(define b 'a)
(??? b 2) 

What write instead of ??? to change a?

-- 
Roman Klochkov
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