How do I compare two columns of data in Numbers to find the unique results?

Hello all,
I'm looking for a way to compare the data from two columns so I can find the unique results and display that data in a third column. To be specific, here's what I'm doing.
Column A is a list of email addresses for people I have already written. Column B is a list of email addresses for people I would like to contact. I am not sure if there are email address from Column A in Column B, but there may be and if there are, I must find out so that I don't send a second email to these recipients. How can I have Numbers look at both columns and tell me which email addresses in Column B are not in Column A?
Thanks for the help!!!

gfmp123,
Here's an alternate use of MATCH to find duplicates. I hope you find one of the two solutions, Wayne's or this one, useful for your case.
The expression in Column C is:
=IFERROR("Dup in Row "&MATCH(B, A,0), "")
Regards,
Jerry

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How do I compare two columns of data in Numbers to find the unique results?

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