[libreoffice-users] IF statement question

Hi Gurus!
I'm getting all in a twist over nested IF statements.
Here's what I want to do.
I have three columns A, B and C.
There is a list in Columns A and B and a result in C, but with gaps in 
each list as under:


A
        B
        C
Fred
        Fred
        
George
        
        X

        James
        Y
Jones
        Jones
        
Smith
        Smith
        


What I'm looking for is a nested IF statement in Column C that says "if 
A=B do blank, otherwise do "X" OR, if A="" then do "Y"
I can do the first condition, but I'm running into trouble combining the 
second in one statement.

Hope that's clear!

Cheers
Gordon

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