People of unalterable ideas still insisted upon calling him "Sergeant" when they met him, which was in some degree owing to his having still retained the well-shaped moustache of his military days, and the soldierly bearing inseparable from his form and training.
There are no more uses of "inseparable" in the book.
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They are inseparable companions.
The Chinese think of Taiwan as an inseparable part of their country.