Which Original air date has a Season # smaller than 21, and a Title of 'palimpsest'?
CREATE TABLE table_76219 (
    "Series #" real,
    "Season #" real,
    "Title" text,
    "Directed by" text,
    "Original air date" text
)
SELECT "Original air date" FROM table_76219 WHERE "Season #" < '21' AND "Title" = 'palimpsest'
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: Which Original air date has a Season # smaller than 21, and a Title of 'palimpsest'? ### Input: CREATE TABLE table_76219 (
    "Series #" real,
    "Season #" real,
    "Title" text,
    "Directed by" text,
    "Original air date" text
) ### Response: SELECT "Original air date" FROM table_76219 WHERE "Season #" < '21' AND "Title" = 'palimpsest'