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Have you tried moving all the numbers into one column and then removing duplicates?
Just cut/paste a column of numbers in into the next column. Just work your way down until all of them have been pasted into the first column.
I would start on the far right column and work that way, it will be easier.
ctrl+shift will be your friend here to highlight all the numbers in a column quickly
I just did this and it took less than 5 min.
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