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Sentence
Span Details
やすやす
easily; readily; with ease-> 易々adverb
安々やすやすcalmly; peacefully; painlessly; comfortably
と
quotation, conditional, companion, or and markergrammar
約束
promise; agreement; one's word; contract; appointment; engagement; date; convention; rule; destiny; fatenoun, suru verb
し
light/support verb with a noun or noun-like phrase-> するgrammar
てはいけない。
must not; may notgrammar