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Creating expression to only catch first instance of match for each pattern in NI requirements gateway

This question is about NI Requirements Gateway 2014 but there isnt a location category to select for it...

 

I am designing my type for a retrieving all unique items (filtering out items that occur more than once in a file, just retrieve the first episode of it) and am experincing much difficulty writing this script...  I have a parts list being extracted from a document where the part may be called out more than once so I just want it to retrieve it once.  

 

How do you do this in this scripting expression window?  I can't find anything on this type of operation in the manual or on line.  Attached is my example of what I am trying to do.  I have 3 copies of U1 in my source file but I only want 1 copy of it to come out of the result of the expression.

 

Any help would be appreciated...

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