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st: check for double id-numbers

From	"Raoul C Reulen" <[email protected]>
To	<[email protected]>
Subject	st: check for double id-numbers
Date	Thu, 24 Nov 2005 11:35:38 -0000

Hi,
 
I have a data file and I want to know whether there are id-numbers that are used twice in the dataset? How can I run a check on this? Thanks.
 
Raoul

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