Find and mark duplicates

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

If I have two columns with data, how do I compare these two columns to find
all duplicates and put an X on a third colum next to all duplicates? Thanks.
 
The problem is, I don't know which two cells to compare, I need to know if
any of the 800 items in the first colum exist in the 600 items of the second
column. It's not a row by row comparison. Thanks.
 

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