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[plt-scheme] problem to create string with unicode

From: Andre Mayers (andre.mayers at usherbrooke.ca)
Date: Sat Sep 6 14:28:43 EDT 2008		 
I want to print a big sigma with 

(display (integer->char 9138))(newline)
(display (integer->char 9139))

or with

(display (string (integer->char 9138) #\return (integer->char 9139)))

but I got extra character

André
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