CREATE TABLE table_name_12 (goals_against INTEGER, draws VARCHAR(255), wins VARCHAR(255), points VARCHAR(255), goal_difference VARCHAR(255))
What is the highest goals against when points are larger than 31, the goal difference is smaller than 9, wins are 13, and draws are larger than 6?
    
SQL: SELECT MAX(goals_against) FROM table_name_12 WHERE points > 31 AND goal_difference < 9 AND wins = 13 AND draws > 6