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実証 じっしょう実験 じっけんじゃなかった
jisshōjikkenjanakatta

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Noun
, 
Da Copula

The past negative form of 実証実験

1. Wasn't a verification experiment.; Wasn't a proof of concept.

Past/Perfective
, 
Negative

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実証実験じゃなかった

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