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難問 / なんもん : n vs 1）perplexity 2）difficult question 3）difficult problem P
難字 / なんじ : n 1）difficult character 2）complicated kanji
難文 / なんぶん : n 1）difficult sentence
難球 / なんきゅう : n 1）(baseball) ball which is hard to hit or catch
難物 / なんぶつ : n 1）hard problem 2）person hard to please 3）hard nut to crack
難点 / なんてん : n 1）fault 2）weakness P
難 / なん : n n-suf 1）difficulty 2）hardships 3）defect P
難い / かたい / がたい / にくい : 1）(aux-adj) difficult 2）hard P
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難問

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