Without reading the novel, I would guess that the three ineradicable mistakes in the character's boss's mind are three mistakes that the character made.
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davkett, if you didn't read the novel you probably take this expression literally, then this expression is as clear (for me) as 2+2=4. What is not clear is a point whether it is an idiom or an or
I'm unclear about what exactly you don't understand in the expression, "three ineradicable mistakes in his mind".
...since you've read the novel that you've found nothing in the six preceding chaptersTo be honest I read only "7. The Purple Wig", because only it was translated and chapters looked rather isolated. Russians translators did not use these "three mistakes", because they translated only chapter seven or may be they translated each chapter in anticipation of their disconnec