Adding hw04
Adding lecture08
Merge branch 'master' of https://github.com/AllenDowney/SoftwareSystems
Turning in HW2Merge branch 'master' of https://github.com/AllenDowney/SoftwareSystems
Adding exam1
Merge branch 'master' of https://github.com/AllenDowney/SoftwareSystems
Exam 1
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