When I was still a student, I didn’t have enough funds in buying books. So I will just borrow some books from the library or from my friends and had it photocopied (because that was fine with my teacher during that time). And there was one copy center which stated that they needed 108r00727 for their machine to function good. During that time, I need to transfer to the nearby copy center and had my books photocopied so that I will be able to study for my exams.  Sigh!  College days were fun and there were lots of challenges!