What date did episode 4 in the season originally air?
CREATE TABLE table_31146 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" real
)
SELECT "Original air date" FROM table_31146 WHERE "No. in season" = '4'
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 date did episode 4 in the season originally air? ### Input: CREATE TABLE table_31146 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" real
) ### Response: SELECT "Original air date" FROM table_31146 WHERE "No. in season" = '4'