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石炭 せきたん紀 きだろう
seki tankidarō

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Noun
, 
Da Copula

Expresses probability ("probably…") of 石炭紀

1. Probably the Carboniferous period.

Presumptive
, 
Conjecture
, 
Geology

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石炭紀だろう

石炭紀だろう【せきたんきだろう】 Activity

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