Recover deleted oracle flashback point I have accidentally deleted a flashback point in a oracle 11g database,Is there a way to recover the restore point

PS:If I have a flashback point A which was created first, and flashback point B which was created later.If I drop flashback point B and flashback to flashback point A will I be able to recover flashback point B.

PPS: there are no other backups to recover from.
I don't think you can get the restore point back, but if you want to flashback the database you can use FLASHBACK DATABASE TO SCN &lt;number&gt; instead. If you know the approximate time you want to revert to you can get the SCN with TIMESTAMP_TO_SCN. This assumes that the data is still there, of course. If not it is gone.