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完全数
noun
(number theory) perfect number, a positive integer that is equal to the sum of its positive divisors, excluding the number itself
水平線
ひらがな
すいへいせん
noun
horizon on water / a horizontal or level line (perpendicular to the force of gravity)
三味線
noun
a Japanese stringed instrument played by plucking, vaguely similar to a banjo / short for 三味線草 (shamisen-gusa): the shepherd's purse, Capsella bursa-pastoris
三味線
noun
(uncommon) a Japanese stringed instrument played by plucking, vaguely similar to a banjo
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