PL/SQL Block to Display

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Write a PLSQL block to display following:
        1
      1 0
      1 0 1
      1 0 1 0

Program:



declare
str varchar2(10):='1010';
begin
for i in 1..4
loop
dbms_output.put_line(substr(str,1,i));
end loop;
end;
/

OutPut:
      
      1
1 0
1 0 1
1 0 1 0