Thank you for waiting! I hope you've enjoyed the problems. Let me know what you think in the comments!
UPD: I almost forgot but here are some notes, as well as challenges for all problems. For a lot of them I don't have a solution and would be happy to hear your ideas.
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Challenge (awful)
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Challenge (?)
Notes
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Challenge (probably doable)
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Challenge (?)
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Challenge (???)
Notes
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Challenge (probably doable)
Notes
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Challenge (?)
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Challenge (running out of ideas)