For Angelique Kerber who had an RR Rate of less than 0.33, what's the appeared?
CREATE TABLE table_6291 (
    "Player" text,
    "Result" text,
    "Appeared" real,
    "RR W\u2013L" text,
    "RR W Rate" real
)
SELECT SUM("Appeared") FROM table_6291 WHERE "RR W Rate" < '0.33' AND "Player" = 'angelique kerber'
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: For Angelique Kerber who had an RR Rate of less than 0.33, what's the appeared? ### Input: CREATE TABLE table_6291 (
    "Player" text,
    "Result" text,
    "Appeared" real,
    "RR W\u2013L" text,
    "RR W Rate" real
) ### Response: SELECT SUM("Appeared") FROM table_6291 WHERE "RR W Rate" < '0.33' AND "Player" = 'angelique kerber'