This should be rather simple. You need to create 1 cell somewhere in your file that you will write the cell count for column Y each week after removing all dupes.
(e.g. How can we know we only have to consider the 500 last rows) Actually, if you already executed the macro last week, the first 3,000 rows won't have any duplicates so the current execution won't change these rows.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.