Jisho

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ふくめんざん 覆面算
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Noun
1. verbal arithmetic; alphametic; cryptarithmetic; cryptarithm; word addition​
Wikipedia definition
2. Verbal arithmetic​Verbal arithmetic, also known as alphametics, cryptarithmetic, crypt-arithmetic, cryptarithm or word addition, is a type of mathematical game consisting of a mathematical equation among unknown numbers, whose digits are represented by letters. The goal is to identify the value of each letter. The name can be extended to puzzles that use non-alphabetic symbols instead of letters. The equation is typically a basic operation of arithmetic, such as addition, multiplication, or division.
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