update public

public/content/exercises/homework01.ipynb

public/content/exercises/homework01.pdf

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public/content/exercises/homework02.html

public/content/exercises/homework02.ipynb

public/content/exercises/homework02.pdf

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public/content/exercises/homework03.ipynb

public/content/exercises/homework03.pdf

public/content/exercises/homework04.ipynb

public/content/exercises/homework04.pdf

public/content/exercises/homework05.ipynb