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чёрного кобеля не отмоешь добела stresses
proverb	the leopard cannot change his spots; the leopard can't change his spots; the wolf may change his coat, but not his disposition; though you cast out nature with a fork, it will still return; you cannot wash charcoal white (дословно: Уголь добела не отмоешь); a leopard can't change his spots (Don Quixote)
Чёрного кобеля не отмоешь добела
proverb	A leopard can't change its spots (bookworm); you can't whitewash a black dog (VLZ_58)
чёрного кобеля не отмыть добела
gen.	a leopard cannot change its spots