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Sentence
Span Details
無断
without permission; unauthorized; without notice; without prior warningnoun, noun prefix
使用
use; utilization; applicationnoun, suru verb
は
topic markergrammar
固く
hard; solid; tough; stiff; tight; wooden; unpolished; strong; firm; not easily moved; steadfast; honest; safe; obstinate; bookish; formal; stuffy-> 硬いi-adjective
お断り
declining; refusal; rejection; notice; announcementnoun
します。
humble or polite verb construction-> お/ご...するgrammar