I have a test table “bbb”.

and do following commands:

variable a varchar2(20);
begin
    :a:='bbb';
end;
/
set heading off;
spool C:Temptest.txt;
set feedback off;

select * from bbb t where t.colb=:a;

spool off;

But I see in test.txt following:

bbb
bbb
a
---------
bbb

How can I rid of information?:

a
---------
bbb

I need only info of result in file:

bbb
bbb

I tried to execute.
SET VERIFY OFF:
SET ECHO OFF;

But it does not help me.