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NSC: Nebraska Service Center
TSC: Texas Service Center
VSC: Vermont Service Center
CSC: California Service Center
NI: Nonimmigrant
EB: Employment Based
EB-1: Employment Based First Preference
EB-2: Employment Based Second Preference
EB-3: Employment Based Third Preference
FB: Family Based
COS: Change of Status
EOS: Extension of Status
EAD: Employment Authorization Document