CREATE TABLE table_name_74 (wins INTEGER, goal_difference VARCHAR(255), goals_against VARCHAR(255), points VARCHAR(255))
What is the highest wins entry with fewer than 51 goals, more than 39 points, and a goal difference smaller than 13?
    
SQL: SELECT MAX(wins) FROM table_name_74 WHERE goals_against < 51 AND points > 39 AND goal_difference < 13