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Overall Editorial

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A - Filter

• Official Editorial by en_translator

B - Middle Letter

• Official Editorial by en_translator

C - log2(N)

• Official Editorial by en_translator

D - Humidifier 2

• Official Editorial by en_translator

E - Ideal Sheet

• Official Editorial by en_translator
• Another Solution by evima
• Easier Implementation by Kiri8128

F - Invisible Hand

• Official Editorial by en_translator
• Supplement to Official Editorial by evima

G - "redocta".swap(i,i+1)

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H - Round Trip

• Official Editorial by en_translator
• User Editorial by llichenyu

I - Hands on Ring (Hard)

• Official Editorial by en_translator