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This is the fifteenth installment of the Fortnightly Topic Challenge described here, with topics suggested and voted on here. This fortnight's topic is (suggested by GentlePurpleRain), and will span from the 5th of September to the 18th of September. During this period, we will compile the list of questions with this tag and post it as an answer to this question.

In the meantime, please go and propose and vote on future challenges!

Everyone have fun, and happy puzzling!


Link to other Fortnightly Topics.

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