Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which Previous Conference has an IHSAA Class/ Football/ Soccer of 4a/5a/2a, and a Year Joined larger than 1926?

### Inputs:
table_name: table, columns: ['School', 'Location', 'Mascot', '# / County', 'Enrollment', 'IHSAA Class / Football/Soccer', 'Year Joined', 'Previous Conference']

### Response:
SELECT Previous Conference FROM table WHERE IHSAA Class / Football/Soccer = 4a/5a/2a AND Year Joined > 1926