What channels first aired on 31 December 1990 in the Southern Downs region?
CREATE TABLE table_name_91 (
    channels___analog___digital__ VARCHAR,
    first_air_date VARCHAR,
    region_served VARCHAR
)
SELECT channels___analog___digital__ FROM table_name_91 WHERE first_air_date = "31 december 1990" AND region_served = "southern downs"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What channels first aired on 31 December 1990 in the Southern Downs region? ### Input: CREATE TABLE table_name_91 (
    channels___analog___digital__ VARCHAR,
    first_air_date VARCHAR,
    region_served VARCHAR
) ### Response: SELECT channels___analog___digital__ FROM table_name_91 WHERE first_air_date = "31 december 1990" AND region_served = "southern downs"