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adjectival nouns or quasi-adjectives (keiyodoshi), nouns which may take the genitive case particle 'no', adverb (fukushi), noun (common) (futsuumeishi)
(in a) long time, long time (ago), while (ago), long ago, long while (ago), (in a) long while
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久々に聞いたこの曲。なつかしい。
Hearing this song after so long really brings back the old times.
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