Please show us examples of the datasets involved. A small portion of each data set ought to be sufficient. Please provide the data sets as DATA step code, as explained in these instructions. Do not provide the data as screen captures or attachments.
Also please explain how we know what these steps should be, given the two data sets, especially the part of the code after THEN
if column_1= 'm' then delete ;
if column_1= 'nn' then clumn_1=plus ;
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Paige Miller