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Thank you Publicus for providing such valuable information in this thread, I almost follow the instruction one step after another.
Also thank you Kabi24 for explaining to me the notice of appearance and give me confidence, I almost thought I have to face the attorney in court.
WOM filed on 07/31/2006
Defendants served on 08/01/2006
Notice of appearance received on 08/11/2006
Contact AUSA on 08/14/2006, got response on same day
I-485 approved on 08/30/2006