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_20217456_7 ( rl_süd__1st_ VARCHAR, rl_südwest__1st_ VARCHAR )

### Question ###
Who was RL S d (1st) when FK Pirmasens was RL S dwest (1st)?

### Accurate SQL ###

SELECT rl_süd__1st_ FROM table_20217456_7 WHERE rl_südwest__1st_ = "FK Pirmasens"