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役 やく立 たたなければならない
yakutatanakereba naranai

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Godan Verb (tsu)
, 
i-Adjective

Expresses obligation ("must do") of 役立つ

1. Must be useful.; Must serve a purpose.

Obligation

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役立たなければならない

役立たなければならない【やくたたなければならない】 Activity

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