How do I identify the belonging Unique Value to a duplicate value via the DuplicateRemover?

How do I identify the belonging to a duplicate value?

 

I use the DuplicateRemover, which outputs the following result:

 

 

For Example:

 

1 -> Unique Port

 

2 -> Unique Port

 

2 -> Duplicate port

 

3 -> Unique Port

 

 

With this Transformer I have now identified the values ??that occur more than once (The second"2").

 

 I want to identify the values(The first "2") which end up?? in the Unique Port, and are identical with the values??, which end up in duplicate port.

 

 

My english is not very good. Hope I have made ??myself clear enough.