Table schema:
CREATE TABLE table_name_76 (administrative_district VARCHAR, pre_1009_province VARCHAR, post_1009_province VARCHAR)

Question: Which Administrative district has a Pre-1009 province of gwannae -do and a Post-1009 province of seohae -do?
SQL: SELECT administrative_district FROM table_name_76 WHERE pre_1009_province = "gwannae -do" AND post_1009_province = "seohae -do"