CREATE TABLE table_7757 ("Province of Silla" CLOB, "Administrative district" CLOB, "Pre-1009 province" CLOB, "Post-1009 province" CLOB, "Modern equivalent" CLOB)

Which Administrative district has a Pre-1009 province of gwannae -do and a Post-1009 province of seohae -do?
SELECT "Administrative district" FROM table_7757 WHERE "Pre-1009 province" = 'gwannae -do' AND "Post-1009 province" = 'seohae -do'
SELECT "Administrative district" FROM "table_7757" WHERE "Post-1009 province" = 'seohae -do' AND "Pre-1009 province" = 'gwannae -do'