Table: high_school_conferences_6
Columns: school
location
mascot
enrollment
ihsaa_football_class
county

Question: Which IHSAA Football Class has a School of wood memorial?
SQL: SELECT "ihsaa_football_class" FROM high_school_conferences_6 WHERE "school" = 'wood memorial'

Question: Which IHSAA Football Class has a County of 77 sullivan, and a School of union dugger?
SQL: SELECT "ihsaa_football_class" FROM high_school_conferences_6 WHERE "county" = '77 sullivan' AND "school" = 'union dugger'

Question: Which IHSAA Football Class has an Enrollment of 406?
SQL: SELECT "ihsaa_football_class" FROM high_school_conferences_6 WHERE "enrollment" = 406