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遡 さかのぼらなければならない
sakanoboranakereba naranai

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Godan Verb (ru)
, 
i-Adjective

Expresses obligation ("must do") of 遡る

1. Must trace back; Must go back; Must revert to

Obligation

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遡らなければならない

遡らなければならない【さかのぼらなければならない】 Activity

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