Minor update to HW4 solution.
Minor update to HW4 solution.


Former-commit-id: f16b601b057c5fb4fbb3567b9c4377fac3fb5fda [formerly 35f1d7172e82a3b2752be36a410763ecc1149869]
Former-commit-id: 5431db0dc2f2b16361417d421a9b4f59d6e63546
justinbois/bebi103_utils