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包絡 ほうらく線 せんじゃなかった
hōrakusenjanakatta

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Noun
, 
Da Copula

The past negative form of 包絡線

1. Wasn't an envelope.; Wasn't a curve of tangency.

Past/Perfective
, 
Negative
, 
Mathematics

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包絡線じゃなかった

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