Answer Posted / m.sivakumar

data dups;
input var1;
datalines;
1
2
3
4
4
3
5
6
;
run;
proc sort data=dups;
by var1;
run;
data dups1;
set dups;
by var1;
if not(first.var1 and last.var1) then output;
run;
proc print data=dups;
run;
proc print data=dups1;
run;

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