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数 すう億 おく年 ねんではありませんでした
sūokunendewārimasendeshita

敬
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Noun
, 
Desu Copula

The polite, past negative form of 数億年

1. Was not several hundred million years.

Past/Perfective
, 
Negative
, 
Polite
, 
Formal Register

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数億年ではありませんでした

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