Which 2nd senior VIII that also has a 4th senior stm?
CREATE TABLE "winning_head_of_the_river_championship_e" (
  "crew" real,
  "open_1st_viii" text,
  "senior_2nd_viii" text,
  "senior_3rd_viii" text,
  "senior_iv" text,
  "year_12_single_scull" text,
  "year_11_single_scull" text
);
SELECT "senior_2nd_viii" FROM "winning_head_of_the_river_championship_e" WHERE "senior_iv"='stm';