Who was RL Süd (1st) when FK Pirmasens was RL Südwest (1st)?
create table table_20217456_7 (rl_süd__1st_ varchar, rl_südwest__1st_ varchar, PRIMARY KEY (rl_süd__1st_))
select rl_süd__1st_ from table_20217456_7 where rl_südwest__1st_ = "fk pirmasens"