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Sentence

彼かれは忍にん耐たい強づよく研けん究きゅうを続つづけた。

Span Details

忍にん耐たい強づよく

persevering; very patient

-> 忍耐強いi-adjective

研けん究きゅう

research; study; investigation

noun, suru verb

continue; keep doing; keep up

-> 続けるichidan verb, auxiliary

past tense or completed action