def validate(points: List[data_model.BulletPoint]) -> List[str]:  
error_messages = []  
if len(points) != n_points:  
error_messages.append(f"You wrote {len(points)} points, not {n_points}")  
for bulletno, bullet in enumerate(points):  
num_title_words = len(bullet.title.split())  
if num_title_words > 10:  
error_messages.append(f"The title of bullet no {bulletno+1} is too long")  
num_bullet_words = len(bullet.explanation.split())  
if num_bullet_words > 200:  
error_messages.append(f"The explanation in bullet no {bulletno+1} is too long")  
return error_messages  
error_messages = validate(result.output)