How to Fix - A MISMATCH Function?

A MISMATCH Function

Hey.
For some reason I can't figure this one out:
I want an array formula that returns the first value in my set that isn't equal to a value or set of values.  Basically if I have 10 unique values in a set, I have 10 formulas, each one resulting in a unique value in the set.  The value is a string.
I could write a UDF to do it, but I'm interested to see the solution with built in functions, since I'm sure it exists, and it's really frustrating me that I can't figure it out.
 
Thanks,
Fred
 
EDIT: In case it matters, every string is either a last name or a first name and last name such as
"Smith" or "John Smith"

Anwsers to the Problem A MISMATCH Function

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Hi,
Let's say you list is in L2 down, Put this ARRAY formula in M2.
ARRAY enter it and drag down to the same length as your list in column L.
It will output blanks when all the unique items ahve been extracted
=IFERROR(INDEX($L$2:$L$9,MATCH(0,COUNTIF($M$1:M1,$L$2:$L$9),0)),"")
Ctrl+Shift+Enter

If this post answers your question, please mark it as the Answer.
Mike H

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