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四 よん色 しょく問題 もんだいじゃなかった
yonshoku mondaijanakatta

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Noun
, 
Da Copula

The past negative form of 四色問題

1. It wasn't the four-color problem.

Past/Perfective
, 
Negative
, 
Mathematics

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四色問題じゃなかった

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