data a;
input (A1 A2 A3) ($);
datalines;
A B D
B B D
D A E
;
data b;
input (B1) ($);
datalines;
A
B
C
;
data want;
if _n_=1 then do;
if 0 then set b;
declare hash h(dataset:'b');
h.definekey('B1');
h.definedone();
end;
set a;
array x{*} a: ;
do i=1 to dim(x);
if h.check(key:x{i}) ne 0 then call missing(x{i});
end;
drop i b1;
run;
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