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過 か酸化 さんか水素 すいそではありませんでした
kasankasuisodewārimasendeshita

敬
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Noun
, 
Desu Copula

The polite, past negative form of 過酸化水素

1. Was not hydrogen peroxide.

Past/Perfective
, 
Negative
, 
Polite
, 
Formal Register

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過酸化水素ではありませんでした

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