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難問題 (なんもんだい) — difficult problem or question
難問題
difficult problem or question
問題 もんだい
question (e.g. on a test); problem
大問題 だいもんだい
big problem; major issue; big controversy
問題化 もんだいか
problematization; making an issue of (something); becoming a problem; becoming an issue
問題無い もんだいない
no problem; all right; not an issue; unobjectionable
別問題 べつもんだい
different thing; another question; different case