Set up the data set.

options nonotes nodate nonumber nocenter formdlim  ='-';
     
data test;
   d=2;
   b001 =1;
   b002 =2;
   b003 =3;
   b001z=1;
   B001a=2;
   CaSeSeNsItIvE2=9;
   CASESENSITIVE3=9;
   D=2;
   casesensitive1=9;
   CaSeSeNsItIvE1a=9;
   d001z=1;   
   CASESENSITIVE1C=9;
   D001a=2;   
   casesensitive1b=9;  
   A =1;
   a002 =2;
   a =3;
   a001z=1;
   A001a=2;
  
run;