Queries :: Custom Delete And Duplicate Query

I am trying to create a query to find duplicates and delete the duplicates. The result will eventually be used in another query (append query) to update a table.I have a table with 4 columns lets say for simplicity they are A, B, C, D

I want my query to find duplicates within B and deleting them. The catch is before deleting them I need to look into column A to ebsure they are actually duplicates. Example below

Example
A B
John Doe Tires
John Doe Wipers
Allison Doe Tires
Allison Doe Tires

As you can see from the above Tires is a duplicate and need to be deleted.

A B
John Doe Tires
John Doe Wipers
Allison Doe Tires