data have;
infile cards missover;
input code f r;
datalines;
1 0.1 1.2
1 0.1
1 0.1
1 0.1
1 0.1
1 0.2
1 0.2
1 0.2
1 0.2
1 0.2
1 0.2
1 0.2
;
data wanted;
set have;
retain temp;
if _n_ ne 1 then r=temp+f*0.4;
temp=r*0.6;
drop temp;
run;


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