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'read from text file' erases the file

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labveiwproblem.png

I am trying to read text in from a text file.  This is the exact code I am using.  For some reason the output from 'read from text file' contains all the text that was originally in the file, but after the code executes the file is empty.  I have several other vi's which use the same code and the file is fine.  But whenever I run this code in this one specific vi the text file gets erased.


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