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原因 げんいん不明 ふめいでした
gen'in fumeideshita

敬
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Noun
, 
Desu Copula
, 
no-Adjective

The polite past form of 原因不明

1. The cause was unknown.; It was unexplained.

Past/Perfective
, 
Polite

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原因不明でした

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