Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_51691 ( "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 )

### Question ###
Which 2nd senior VIII that also has a 4th senior stm?

### Accurate SQL ###

SELECT "Senior 2nd VIII" FROM table_51691 WHERE "Senior IV" = 'stm'