~次第 (as soon as)

The noun/suffix 次第 attached to a verb masu-stem, meaning 'as soon as [verb],' 'immediately upon [verb]ing.' Formal/written register; common in business and polite speech — 届き次第 ('as soon as it arrives'), 連絡次第 ('as soon as I hear back'), 分かり次第 ('as soon as I find out').