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We have two pools of contact information, one with about 2,800 records (Sheet A), the other with about 5,000 records (Sheet B). Each needs to be cleaned up of duplicates within the sheet itself, then the two need to be compared against each other and any records that are in Sheet A and also appear in Sheet B need to be deleted so that Sheet B has only unique contacts not found in Sheet A.
This will require a lot of attention to detail, as duplicates may not be readily apparent and various information will have to be compared (phone number, name, email address, etc.) to spot them.