Who is the directed by when 2t6404 is the production code?
CREATE TABLE table_30651 (
    "No." real,
    "#" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "U.S. air date" text,
    "Production code" text,
    "U.S. viewers (million)" text
)
SELECT "Directed by" FROM table_30651 WHERE "Production code" = '2T6404'
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: Who is the directed by when 2t6404 is the production code? ### Input: CREATE TABLE table_30651 (
    "No." real,
    "#" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "U.S. air date" text,
    "Production code" text,
    "U.S. viewers (million)" text
) ### Response: SELECT "Directed by" FROM table_30651 WHERE "Production code" = '2T6404'