SCHEMA:
CREATE TABLE table_name_81 (goal_difference INTEGER, draws VARCHAR, wins VARCHAR, losses VARCHAR)
USER:
What is the lowest goal difference a club with more than 13 wins, less than 8 losses, and less than 11 draws has?

QUERY:
SELECT MIN(goal_difference) FROM table_name_81 WHERE wins > 13 AND losses < 8 AND draws < 11