How will you assign all the variables of an dataset into a
macro variable separated by a space? For example if a
dataset has variables A,B,C. Assign them to a macro variable
X as
X=A B C
How would you code a merge that will write the matches of
both to one data set, the non-matches from the left-most
data set to a second data set, and the non-matches of the
right-most data set to a third data set.
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