Typos
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\begin{document}
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\problem{One Hundred and Fourty-Five Doors}
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\problem{One Hundred and Forty-Five Doors}
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A prisoner was thrown into a medieval dungeon with 145 doors. Nine, shown by black bars, are locked, but each one will open if before you reach it you pass through exactly 8 open doors. \\
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You don't have to go through every open door but you do have to go through every cell and all 9 locked doors. If you enter a cell or go through a door a second time, the doors clang shut, trapping you. \\
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\begin{document}
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\problem{One Hundred and Fourty-Five Doors}
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\problem{The Air Parade}
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Volodya asked, ``What plane did you fly during the air parade?'' His father sketched a formation of 9 planes.
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\problem{}
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If you'd like to know more, check out \url{https://regexr.com}. It offers an interative regex prompt, as well as a cheatsheet that explains every other regex token there is. \par
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If you'd like to know more, check out \url{https://regexr.com}. It offers an interactive regex prompt, as well as a cheatsheet that explains every other regex token there is. \par
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You will find a nice set of challenges at \url{https://alf.nu/RegexGolf}.
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I especially encourage you to look into this if you are interested in computer science.
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\end{document}
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