Unique values in group collection

Brass Contributor


I have a collection that displays the results of employees' certifications.
The certificate shows the "position" where an employee can work.

One employee can have several result pass and not pass.

I need to display the last exam result based on position.


I have grouped the collection by "Position_certification":






And now I need to filter "UserData" so that only the latest and unique values by user`s email stay in.



In the end, I need a collection with all unique employees with their latest certification result


Could someone help with this challenge? 

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