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有効 ゆうこう
yūkō

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Noun
, 
na-Adjective

1. valid; effective

Antonym of 無効
その切符 きっぷは一 いち週間 しゅうかん有効 ゆうこうです。
sono kippuwa isshūkan yūkōdesu.
The ticket is valid for a week.
Noun

2. yuko (judo)

Martial Arts

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有効

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