Please identify which lecture is most closely related to your question. Even if you have a question about something in exercises or graded homework, still try to indicate the lecture that is most closely related to your question. Your answer should be a number in {0, 1, 2, ..., 13}. For instance, lectures/chapters 0 and 1 were covered on February 20, lecture/chapter 2 was covered on February 27, ..., and lecture/chapter 13 will be covered on May 29.