Formula or VBA - Comparison CSV Values between 3 cells for used range. Find unique values.

Hello,

How do I find the unique CSV values for the used range between columns B, C, D (could be any difference between the CSV and any set of data).Many values are common between columns but I only need the unique values.

Example given in spreadsheet attached. Column D to populated.

Can formula do this - if not what is the VBA code?

If this was 2 columns how can I adjust.


Thank you,