Alternatively,
You may use proc sql or proc sort to select distinct values, order them by their key variables, and use point option in data step to select the records of your choice.
proc sql noprint;
create table two as select distinct * from one order by var1,var2;
select count(*) into :n from two;
quit;
data three;
do rcrd=1,2,3,4,5,(&n-4),(&n-3),(&n-2),(&n-1),&n;
set two point=rcrd;
output;
end;
stop;
run;
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