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プルトニウム２ に３ さん９ きゅうだろう
purutoniumuni sankyūdarō

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Noun
, 
Da Copula

Expresses probability ("probably…") of プルトニウム２３９

1. Plutonium-239 probably.; It's likely plutonium-239.

Presumptive
, 
Conjecture

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プルトニウム２３９だろう

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