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四 よん塩化 えんかケイ素 けいそでした
yon'enkakeisodeshita

敬
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Noun
, 
Desu Copula

The polite past form of 四塩化ケイ素

1. It was silicon tetrachloride.

Past/Perfective
, 
Polite

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四塩化ケイ素でした

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