cryptarithmetic
alphametics as a genre of puzzle
The fourth Sunday before Christmas Day, the start of Advent: 30 November (Saint Andrew's Day) or the nearest Sunday to it.
plural of disco perm
plural of acetylsalicylate
雑誌の暗号算は熟練のパズル愛好家でさえ手こずらせ、文字を数字に対応させて長い足し算を成立させる必要がありました。
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