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級数 / きゅうすう : n 1）(math) series 2）progression
素数 / そすう : n 1）prime number 2）prime numbers
級 / きゅう : n n-suf 1）class, grade, rank 2）school class, grade P
級別 / きゅうべつ : n 1）grading 2）classification
級友 / きゅうゆう : n 1）classmate
級長 / きゅうちょう : n 1）head of class 2）monitor
紙数 / しすう : n 1）number of pages 2）page space
紛然 / ふんぜん : n adj-t 1）confusion 2）disorder
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級数

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