The 51 points against, how many are for?
CREATE TABLE table_31879 (
    "Played in" text,
    "Matches" text,
    "Lost" text,
    "Drawn" text,
    "Points for" text,
    "Points against" text
)
SELECT "Points for" FROM table_31879 WHERE "Points against" = '51'
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: The 51 points against, how many are for? ### Input: CREATE TABLE table_31879 (
    "Played in" text,
    "Matches" text,
    "Lost" text,
    "Drawn" text,
    "Points for" text,
    "Points against" text
) ### Response: SELECT "Points for" FROM table_31879 WHERE "Points against" = '51'