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不
ふ
遡
そ
及
きゅう
Meanings
Noun
Law
1. non-retroactivity
Kanji used
不
negative
遡
go upstream
及
reach
Used in: 4
Composed of
不
ふ
un-; non-; negative prefix
遡
そ
及
きゅう
tracing back; retroactivity