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before very long; soon; someday; one of these days; sooner or later
of the previously mentioned; of that number; among them; among others
そのうち詳しく説明しますね。
I'll explain it in detail before long.
候補は十二人いたが、そのうち面接に進めたのはわずか四人だった。
There were twelve candidates, but of those only four advanced to the interview stage.
そのうち答えが出るはずです。
An answer should come out before long.