select rownum from (
select aa.a from (
select a.a from (select '1' as a,'2' as b from dual union all
select '1' as a,'2' as b from dual
) a,
(select '1' as a,'2' as b from dual union all
select '1' as a,'2' as b from dual
) b
) aa,(
select a.a from (select '1' as a,'2' as b from dual union all
select '1' as a,'2' as b from dual
) a,
(select '1' as a,'2' as b from dual union all
select '1' as a,'2' as b from dual
) b
) bb
) aaa,
(
select aa.a from (
select a.a from (select '1' as a,'2' as b from dual union all
select '1' as a,'2' as b from dual
) a,
(select '1' as a,'2' as b from dual union all
select '1' as a,'2' as b from dual
) b
) aa,(
select a.a from (select '1' as a,'2' as b from dual union all
select '1' as a,'2' as b from dual
) a,
(select '1' as a,'2' as b from dual union all
select '1' as a,'2' as b from dual
) b
) bb