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Finding Duplicates Using Multiple Columns

I have columns:

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

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 want to combine data from several worksheets into one worksheet.

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