CREATE TABLE table_13399573_4 (points_against VARCHAR2, points VARCHAR2)

In the 2008/2009 season one team had a season total points of 31, for that team how many total points were scored against them?
SELECT points_against FROM table_13399573_4 WHERE points = "31"
SELECT "points_against" FROM "table_13399573_4" WHERE "31" = "points"