CREATE TABLE table_name_75 (staffel_a VARCHAR(255), staffel_b VARCHAR(255), staffel_d VARCHAR(255), staffel_c VARCHAR(255))
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 table_name_75 WHERE staffel_d = "energie cottbus" AND staffel_c = "chemie leipzig" AND staffel_b = "1. fc union berlin"