It may happen that you imported your data and mismanaged duplicate prevention settings, or simply want to check if there are contacts with the same last name to ensure you don't have any potential duplicates.
To build the view you should go to your contacts (or any other folder you need to look for duplicates) folder and switch from List view to Last name or Email, depending on how you wish to search for the potential duplicate (unique filed). Ensure you have Order column by total records (Descending), so you can see potential duplicates in the first columns:
Save the view, so you can come back to it after merging records:
Select records you wish to merge and click an arrow sign to do this:
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