data back;
input var1-var3;
cards;
1 2 3
1 2 3
1 2 3
1 2 3
;
data back1;
length var3 8. var1 8. var2 8.;
set back;
run;
data back2;
label var3 = '국어'
var1 = '산수'
var2 = '영어';
set back;
run;
data back3;
attrib var3 length = 8 label = '국어' format = 8.
var1 length = 8 label = '산수' format = 8.
var2 length = 8 label = '영어' format = 8.
;
set back;
run;
data back4;
retain var3 var1 var2;
set back;
run;
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