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場合の数 ばあいのかず
number of possible outcomes; number of ways (e.g. of arranging something)
簡単 かんたん
simple; easy; uncomplicated
単位 たんい
unit (e.g. meters, grams, etc.); denomination
単位(数の…) たんい(すーの…)
mathematical unit
単純 たんじゅん
simple; plain; uncomplicated; straightforward; simple-minded; naive