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遡 さかのぼらなければいけない
sakanoboranakereba ikenai

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Godan Verb (ru)
, 
i-Adjective

Alternative obligation form of 遡る

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

Obligation

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遡らなければいけない

遡らなければいけない【さかのぼらなければいけない】 Activity

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