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Finding Duplicates Using Multiple Columns

I have columns:

D: First Name
F: Last Name
H: Address
J: City
K: State
L: ZIP

I need a formula or a way to find duplicates using all of these columns, so I have a sheet with 20,000 rows, if any row for all those columns has exact values, then ID them as a Duplicate in a column or something like that, please help!

Thank you.


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I have looked over the forums for information on how to do this, and can not find anything. I have used conditional formatting to identify duplicates in my spreadsheet. I have a unique user ID, which combines the first and last name fields into one. However, in 10,000 there are a number of John Smiths, Joe Adams, etc. With smaller lists, we search manually, and then add a 1, 2, 3, etc to each duplicate to create a unique value for the User ID.

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