Need Help to create the logic according to the description

[nitink26]

data test;
a1= "aa";
a2= "bb";
a3= "cc";

b1= "bb";
b2= "bb";
b3= "cc";

/*After comparison*/
comp1= "No";
comp2= "Yes";
comp3= "Yes";
run;

What I am looking for  -

if a1 in (b1,b2,b3) the comp1 = 'Yes';
else comp1 = 'No';
as we don't find the match for a1 in any of (b1,b2,b3) then comp1= "No" and our next scenario will be

if a2 in (b1,b2,b3) the comp1 = 'Yes';
else comp2 = 'No';

now we found a match for a2 in b1 then comp2= "Yes" and will not include that column where we found the matching value in next scenario and our next scenario will be

if a3 in (b2,b3) then comp3 = 'Yes';
else comp3 = 'No';

now we found a match for a3 in b2 then comp3= "Yes" and our next scenerio will be if there are anything else

if a4 in (b3) then comp3 = 'Yes';
else comp3 = 'No';

Thanks!

[andreas_lds · Accepted solution]

If the values of the a-variables are that simple, this should work:

data want;
   set test;
   
   length compare1-compare3 $ 3;
   
   array a_vars[3] a1-a3;
   array cmp[3] compare1-compare3;
   
   cmp_string = catx('|', of b1-b3);
   
   do i = 1 to dim(a_vars);
      if findw(cmp_string, a_vars[i], '|', 't') > 0 then do;
         cmp_string = tranwrd(cmp_string, a_vars[i], ' ');
         cmp[i] = 'yes';
      end;
      else do;
         cmp[i] = 'no';
      end;
   end;
   
   drop cmp_string i;
run;