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_56 (goal_difference VARCHAR, points_1 VARCHAR, goals_against VARCHAR)
### Question:
When the Points 1 was 51 and the Goals Against was less than 66, what was the Goal Difference?
### Answer:
SELECT goal_difference FROM table_name_56 WHERE points_1 = "51" AND goals_against < 66