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			Simple. In the intro, a voice-ver may explain something too in-depth, or accidentially, that ruins a twist or turn later on.  
 
I heard this was the case in one version, here. Where the introductory voice-over gives off a major clue that lessens the experience. 
 
PS... we have the same post count.
		 
		
		
		
		
		
		
		
		
	
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