Table schema:
CREATE TABLE table_name_22 (previous_conference VARCHAR, ihsaa_class___football_soccer VARCHAR, year_joined VARCHAR)

Question: Which Previous Conference has an IHSAA Class/ Football/ Soccer of 4a/5a/2a, and a Year Joined larger than 1926?
SQL: SELECT previous_conference FROM table_name_22 WHERE ihsaa_class___football_soccer = "4a/5a/2a" AND year_joined > 1926