the white letter u got it was the one that said what evidence they were requesting and the blue one was to return it back with ur evidence
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Application Delivered-12/12/2012
Bio metrics done: 1/22/13
RFE: 3/13/1
RFE Letter receive: 3/18/13 RFE sent back:3/19/13RFE Receive/status update: 3/20/13
approved: 5-30-13