Create Matching Rules and Duplicate Rules, and run a duplicate job to see a list of duplicate records.
Before you can see a list of duplicate record sets on the Contact Merge page, you'll need to:
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Create Matching Rules to tell Salesforce how to look for duplicates.
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Create Duplicate Rules to tell Salesforce what to do when it finds duplicates as they're created, or
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Run a Duplicate Job to find existing duplicates.