What is the highest rank for a 6:52.70 time and notes of sa/b?
CREATE TABLE table_63789 (
    "Rank" real,
    "Athlete" text,
    "Country" text,
    "Time" text,
    "Notes" text
)
SELECT MAX("Rank") FROM table_63789 WHERE "Notes" = 'sa/b' AND "Time" = '6:52.70'
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 highest rank for a 6:52.70 time and notes of sa/b? ### Input: CREATE TABLE table_63789 (
    "Rank" real,
    "Athlete" text,
    "Country" text,
    "Time" text,
    "Notes" text
) ### Response: SELECT MAX("Rank") FROM table_63789 WHERE "Notes" = 'sa/b' AND "Time" = '6:52.70'