I finally had time to review the grading for Question 4 of Homework 2 and have updated the Grades page in response. In general, if you had points taken off for that question: you had 4 points added back. There were a few students, unfortunately, whose answers were such that I couldn't give any points back. If you were expecting your score to improve and it didn't change, then feel free to contact me and I'll discuss the situation with you.