user: Question: What is the average goal difference of club Cultural Leonesa, which has more than 27 points and less than 9 losses?
Columns: ['Position', 'Club', 'Played', 'Points', 'Wins', 'Draws', 'Losses', 'Goals for', 'Goals against', 'Goal Difference']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Cultural Leonesa', 30.0, 40.0, 18.0, 4.0, 8.0, 68.0, 38.0, 30.0]
SQL:

assistant: SELECT AVG("Goal Difference") FROM "Table" WHERE "Points" > 27.0 AND "Losses" < 9.0 AND "Club" = 'Cultural Leonesa';