{"head":"24eb1186b01bda20a751bb1da1048f829a4a7ffb","size":1,"push_id":44676578,"shas":[["24eb1186b01bda20a751bb1da1048f829a4a7ffb","1d4d6b566fb91390e3ec85436afec31c63e2167a@gmail.com","Added chapter 5 exercises","Christopher Wu"]],"ref":"refs/heads/master"}