0000000000000000000000000000000000000000 fd10576a818a8453f274d76a688aa6757d63f643 Jennifer Bi <jb3495@columbia.edu> 1556923757 -0400	fetch --append origin: storing head
fd10576a818a8453f274d76a688aa6757d63f643 91090392167a6e888607a6d318067abe1f562cf6 Jennifer Bi <jb3495@columbia.edu> 1557515943 -0400	pull: fast-forward
