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As the system returns input unchanged if there is absolutely no match, you can use the Object.ReferenceEquals approach to ascertain whether or not the process has built any replacements into the enter string.?�が?�詞?�し?�使?�れ?�場?�、物?�人?�元?�の位置?�状?�か?�新?�い?�の?�交?�さ?�る?�と