Homework 2#18

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westwardstations wants to merge 3 commits intomac-comp394:masterfrom

westwardstations:master

Commits on Mar 7, 2018

states in part 1 added. now to do the tests.
westwardstations
committed

Commits on Mar 9, 2018

tests in part 1 have been added. now on to part 2.
westwardstations
committed

Commits on Mar 10, 2018

part 2 finished.
westwardstations
committed