how can i rewrite this function
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=IF(ISNA(A1),IF(ISNA(A2),IF(ISNA(A3),A4,A3),A2),A1)
i have a list of values in the column A1:A20 i want to use the
the functions is :
if the value of A1 is wrong use A2, but if the value of A2 is wrong use A3, and if the value of A3 is wrong use A4 ...... and so on up to A20
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