It depends how you want to display things countif(a:A,b1) would tell you
how many times the value in cell b1 appears in column a, say in cell c1

It could be changed into an if statement

=if(countif(a:a,b1)0,"Duplicate","Unique")

in d1

=if(countif(b:b,a1)0,"Duplicate","Unique")

both these formulas could be copied down to all the rows and maybe then
filter by these values to select what you require

Regards

Dav


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