On July 15, 1984 what surface was used?
CREATE TABLE table_55415 (
    "Edition" text,
    "Round" text,
    "Date" text,
    "Surface" text,
    "Opponent" text,
    "Result" text
)
SELECT "Surface" FROM table_55415 WHERE "Date" = 'july 15, 1984'
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: On July 15, 1984 what surface was used? ### Input: CREATE TABLE table_55415 (
    "Edition" text,
    "Round" text,
    "Date" text,
    "Surface" text,
    "Opponent" text,
    "Result" text
) ### Response: SELECT "Surface" FROM table_55415 WHERE "Date" = 'july 15, 1984'