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Sentence analysis
6Spans
Sentence
Span Details
前代未聞
unprecedented; unheard-of; record-breakingnoun, no-adjective
の
possession, attribution, nominalizer, or nominal linkergrammar
記録
record; log; documentation; record (sports, etc.); best marknoun, suru verb
を
object markergrammar
達成
achievement; attainment; realizationnoun, suru verb
した。
light/support verb with a noun or noun-like phrase-> するgrammar