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Overall Editorial

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C - A^A

• Official Editorial by Nyaan
• Official Editorial by admin
• User Editorial by KumaTachiRen

D - Playing Cards Validation

• Official Editorial by cn449
• Official Editorial by admin
• 正規表現を用いた解法 by HideN2000

E - Socks

• Official 解説 by yuto1115
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• ユーザ解説 by drken

F - LRUD Instructions 2

• Official Editorial by kyopro_friends
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• ユーザ解説 by drken

G - Writing a Numeral

• Official Editorial by m_99
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• User Editorial by rsk0315