When did the old manager vacate his position in Plymouth Argyle?
CREATE TABLE table_19359427_6 (
    date_of_vacancy VARCHAR,
    team VARCHAR
)
SELECT date_of_vacancy FROM table_19359427_6 WHERE team = "Plymouth Argyle"
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: When did the old manager vacate his position in Plymouth Argyle? ### Input: CREATE TABLE table_19359427_6 (
    date_of_vacancy VARCHAR,
    team VARCHAR
) ### Response: SELECT date_of_vacancy FROM table_19359427_6 WHERE team = "Plymouth Argyle"