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    Checking for duplicates by matching 3 separate criteria

    I have a column (A) of dates from 2007-2014 (m/d/yr). I have another column (B) of analytes that are tested. My last column (C) is a grouping of three categories, lets say categories 1,2,3. So for each date a set of analytes are tested amongst 3 categories. I cant figure out a formula that...

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