completed up until 5.1#23

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StevenS125 wants to merge 8 commits intocurriculeon:masterfrom

StevenS125:master

Commits on Jul 22, 2020

completed thru part 4
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Commits on Jul 23, 2020

Commits on Jul 27, 2020

finished students
StevenS125
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Commits on Jul 28, 2020

added instructors class
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Commits on Aug 1, 2020