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リアルタイムＯＳ おうえすでした
riarutaimu ōe sudeshita

敬
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Noun
, 
Desu Copula

The polite past form of リアルタイムＯＳ

1. Was a real-time OS.

Past/Perfective
, 
Polite
, 
Computing

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リアルタイムＯＳでした

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