Added HW3.
Added HW3.


Former-commit-id: 2e125d1c11df2d13acb3c50947d08c2ff002d52b [formerly 0c78c6ce4bd1bae81501057468eb3f9f766d63bb]
Former-commit-id: 4a8537f63d82ab05707a11e83f3103ead410b012
justinbois/bebi103_utils