Table: head_of_river_qld
Columns: crew
open_1st_viii
senior_2nd_viii
senior_3rd_viii
senior_iv
year_12_single_scull
year_11_single_scull

Question: Which 2nd senior VIII that also has a 4th senior stm?
SQL: SELECT "senior_2nd_viii" FROM head_of_river_qld WHERE "senior_iv" = 'stm'