DECLARE 
 
type col_test is TABLE OF VARCHAR2(10); 
original col_test; 
copy col_Test; 
 
BEGIN 
original := col_test('a', 'b', 'c', 'd', 'b', 'c', 'd', 'b', 'c'); 
copy := SET(original); 
 
IF (original.count <> copy.count) THEN 
dbms_output.put_line('Duplicated'); 
END IF; 
 
FOR i IN 1 .. copy.count 
LOOP 
dbms_output.put_line(copy(i)); 
END LOOP; 
END;