How many episodes have been directed and written by Darrick Bachman and Brett Varon?
CREATE TABLE table_909 (
    "No. in series" text,
    "No. in season" text,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Storyboarded by" text,
    "Original air date" text,
    "Production code" text
)
SELECT COUNT("Directed by") FROM table_909 WHERE "Written by" = 'Darrick Bachman and Brett Varon'
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: How many episodes have been directed and written by Darrick Bachman and Brett Varon? ### Input: CREATE TABLE table_909 (
    "No. in series" text,
    "No. in season" text,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Storyboarded by" text,
    "Original air date" text,
    "Production code" text
) ### Response: SELECT COUNT("Directed by") FROM table_909 WHERE "Written by" = 'Darrick Bachman and Brett Varon'