What is the series number for the episode written by janet leahy?
CREATE TABLE table_2818164_4 (
    no_in_series INTEGER,
    written_by VARCHAR
)
SELECT MIN(no_in_series) FROM table_2818164_4 WHERE written_by = "Janet Leahy"
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 is the series number for the episode written by janet leahy? ### Input: CREATE TABLE table_2818164_4 (
    no_in_series INTEGER,
    written_by VARCHAR
) ### Response: SELECT MIN(no_in_series) FROM table_2818164_4 WHERE written_by = "Janet Leahy"