What's the average rebs before 1972?
CREATE TABLE table_55656 (
    "Player" text,
    "Pos." text,
    "From" real,
    "School/Country" text,
    "Rebs" real,
    "Asts" real
)
SELECT AVG("Rebs") FROM table_55656 WHERE "From" < '1972'
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's the average rebs before 1972? ### Input: CREATE TABLE table_55656 (
    "Player" text,
    "Pos." text,
    "From" real,
    "School/Country" text,
    "Rebs" real,
    "Asts" real
) ### Response: SELECT AVG("Rebs") FROM table_55656 WHERE "From" < '1972'