instruction: For the Crew with Year 9 2nd Quads of STM, Year 9 1st Quads of SOM, and a Year 8 3rd Quads of STA what was the Year 8 1st Quads?
response: SELECT "Year 8 1st Quad" FROM table_57409 WHERE "Year 9 2nd Quad" = 'stm' AND "Year 9 1st Quad" = 'som' AND "Year 8 3rd Quad" = 'sta'