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古生 こせい代 だいじゃありませんでした
kosei daija arimasendeshita

敬
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Noun
, 
Desu Copula
, 
no-Adjective

The polite, past negative form of 古生代

1. Was not the Paleozoic era.; Wasn't from the Paleozoic era.

Past/Perfective
, 
Negative
, 
Polite
, 
Terminal Form

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古生代じゃありませんでした

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