The term dataframe tells me you're coming from R or Python, SAS uses data sets. Either way, you need to convert that list to a macro variable, similar to creating it as a list in R/Python and then add that to your data frame in a KEEP statement. If you're familiar with R, KEEP is similar in functionality to the SELECT operator in Tidyverse. PaigeMiller's solution does this, convert the data frame into a variable that can be used in the next steps.
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