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KJV - And they knew not that Joseph understood them; for he spake unto them by an interpreter.
ASV - And they knew not that Joseph understood them; for there was an interpreter between them.
BBE - They were not conscious that the sense of their words was clear to Joseph, for he had been talking to them through one who had knowledge of their language.
WEB - They didn't know that Joseph understood them; for there was an interpreter between them.
YLT - And they have not known that Joseph understandeth, for the interpreter `is' between them;