What is difference between (a-z) and (a--z)

Answer Posted / lucyl

data k;
input a1 a2 a4 a3;
datalines;
1 2 3 4
5 6 7 8
;
run;

proc print data=k;
var a1-a3;
run;

proc print data=k;
var a1--a3;
run;

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