Table: ddr_league_seasons
Columns: season
staffel_a
staffel_b
staffel_c
staffel_d
staffel_e

Question: Which season has a Staffel E of Stahl Riesa?
SQL: SELECT "season" FROM ddr_league_seasons WHERE "staffel_e" = 'stahl riesa'

Question: What is the Staffel D in the season 1983-84 with a Staffel E of Motor Suhl?
SQL: SELECT "staffel_d" FROM ddr_league_seasons WHERE "staffel_e" = 'motor suhl' AND "season" = '1983-84'

Question: What is the Staffel A that has a Staffel D of Energie Cottbus and a Staffel C of Chemie Leipzig and a Staffel B of 1. FC Union Berlin?
SQL: SELECT "staffel_a" FROM ddr_league_seasons WHERE "staffel_d" = 'energie cottbus' AND "staffel_c" = 'chemie leipzig' AND "staffel_b" = '1. fc union berlin'

Question: What is the Staffel B that has Hallescher Fc Chemie as Staffel C?
SQL: SELECT "staffel_b" FROM ddr_league_seasons WHERE "staffel_c" = 'hallescher fc chemie'