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オペレーションシステムじゃなかったです
operēshonshisutemujanakattadesu

敬
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Noun
, 
Desu Copula

The polite, past negative form of オペレーションシステム

1. Was not an operating system.

Past/Perfective
, 
Negative
, 
Polite
, 
Casual Register
, 
Computing

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