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Use "identicalness" in a sentence
"Had they not worn different colors, it would have been impossible to tell them apart, and that was very strange in mature men: identicalness diminished with the years."
"She thought we needed to play off our identicalness, that one day we'd learn to appreciate our unique situation."
"She has an high opinion of her sex, to think they can charm so long a man so well acquainted with their identicalness."