Perhaps a macro variable with multiple variables as strings.
For example, I think it is below.
%let mbr=mbr1 mbr2 mbr3;
%let mbr=mbr:;
The macro variable (it's not a macro call, because those start with a percent sign) can contain anything that is valid code at this place. It must contain a list of variable names (because of the asterisk), but it could also contain a $ sign (or VARCHAR) to specify a character array, and it could also contain a list of initial values.
If you want to know what is actually used, add a
%put &mbr.;
statement right before the ARRAY statement.
To see what may appear in the macro variable, study the documentation of the ARRAY Statement.
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