Compare lists for additions and subtractions
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=SUMPRODUCT(--(COUNTIF(LastMonth,ThisMonth)=0))
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=SUMPRODUCT(--(COUNTIF(ThisMonth,LastMonth)=0))
Continue
=SUMPRODUCT(--(COUNTIF(ThisMonth,LastMonth)=1))
Using Advanced Filter and these formulas can give you
the list of names instead of just the count.
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