Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_31 (goals_against INTEGER, points VARCHAR, goal_difference VARCHAR)
### Question:
What is the lowest goals against value for a team with 83 points and a difference over 50?
### Answer:
SELECT MIN(goals_against) FROM table_name_31 WHERE points = 83 AND goal_difference > 50