if you want to talk about your prelim for a regrade, here's the plan of
action:
    first talk to the TA that graded the question;
    if that is not good enough, you can talk to Rama (ramasv@cs);
    if that is not good enough, you can talk to me (mosse@cs);
    if you want to discuss your situation with respect to the course, make an appointment (thowe@cs.cornell.edu, or mosse@cs.cornell.edu)