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		 Oh, that's not true at all.  An example that comes to mind apropos is Robert Wise's million-years-later director's cut of Star Trek: The Motion Picture.  New effects, some judicious editing. 
  
Still the most atrocious movie.  But improved. 
  
  
There are many examples. It's case-by-case. 
		
	
		
		
		
		
		
	
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