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ブラックボックスではありませんでした
burakkubokkusudewārimasendeshita

敬
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Noun
, 
Desu Copula

The polite, past negative form of ブラックボックス

1. Was not a black box.; It was not a black box.

Past/Perfective
, 
Negative
, 
Polite
, 
Formal Register
, 
Aviation

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ブラックボックスではありませんでした

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