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失効 しっこうではありません
shikkōdewa arimasen

敬
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Noun
, 
Desu Copula
, 
Negation Auxiliary

The polite negative form of 失効

1. Is not invalid.; Is not expired.; Is not ineffective.

Negative
, 
Polite
, 
Formal Register

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失効ではありません

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