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石炭 せきたん紀 きではありません
sekitankidewārimasen

敬
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Noun
, 
Desu Copula
, 
Negation Auxiliary

The polite negative form of 石炭紀

1. It is not the Carboniferous period.

Negative
, 
Polite
, 
Formal Register
, 
Geology

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石炭紀ではありません

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