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compare for duplicates

compare for duplicates

compare for duplicates

I have an excel file with 7000 rows. Column B's  alphanumeric values are 3 to 8 character lot#'s and column C's numeric values are 3 character associated suffix's. After sorting entire file by column B,   I drag down this formula to tag all duplicate shop orders which is the combination of B's lot# and C's suffix:
=IF(AND(B2=B3,C2=C3),"duplicate","not duplicate")
This tags all duplicates EXCEPT the last duplicate.  I then autofilter all the "TRUE" and then print that as my exception report. I need a macro that will loop and tag ALL duplicates.  I've toy'd with some
A=[b2].value & [c2].value
and some  "Do While A"    statements but no luck yet.  Then it would be nice if I could print to  sheet2 but only the tags are really needed at this time.

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