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オープンシステムじゃありませんでした
ōpunshisutemujārimasendeshita

敬
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Noun
, 
Desu Copula

The polite, past negative form of オープンシステム

1. Was not an open system.; It wasn't an open system.

Past/Perfective
, 
Negative
, 
Polite
, 
Terminal Form

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