How do I extract duplicates that occur only twice in my data?

[GaRaGe]

I am using Unique macro to get the duplicates from my data set and join it back to the main data to fetch all the duplicates. However, my ultimate goal is to identify the duplicates which occur only twice 

For example, my data is (A,B,C,A,D,B,A,C,D,D,A,B)

my output should return (C,C,D,D) . it should ignore A,B as they are occurring more than twice. 

Any suggestions on how to do it?

[DataBlender · Accepted solution]

Hi @GaRaGe

You could use summarize tool to group by the relevant field(s) that you had been using in your unique tool.

Then do a count of a records and filter only for records that occur twice. You can then join this result back on to your original dataset.

[jdunkerley79 · Accepted solution]

You can use a Summarise tool to get number of each instances, filter where the count is two and then a Join tool to filter down to just those record.

Sample attached.