Highlighting all duplicates except the last instance

Hi All, I have a problem and this is beyond my ability.

I have a sheet of data that is never sorted or filtered, and I need to only use the last instance of any duplicate, what id like to do is highlighted all previous duplicates but NOT the last instance.

Im sure this is possible but I have no idea where to start, any help would be appriciated.

Hi,

I assumed the data to look for is in column A, try this:

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Regards