table is not complete.
You have a line like this:
73 2012-11-15 09:47:48 383 100 owner emma(ABC3EF) comment by jason(100)
But WHERE in that data does it say the Emma
(or userid ABC3EF
) is the owner of that itemid???
In your prior posts, the "owner" of an itemid could be determined. Can't be done with this limited data.
Back to the drawing board.