Table schema:
CREATE TABLE table_name_27 (buechel_ VARCHAR, _manhart_spelling__pronunciation_ VARCHAR, dakota_mission VARCHAR, deloria_ VARCHAR, _boas VARCHAR)

Question: Deloria & Boas of ų, and a Dakota Mission of un had what Buechel & Manhart spelling (pronunciation)?
SQL: SELECT buechel_ & _manhart_spelling__pronunciation_ FROM table_name_27 WHERE deloria_ & _boas = "ų" AND dakota_mission = "un"