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Continue to ChatDo you remember me telling you we are practicing non-verbal spells, Potter?" "Yes," said Harry stiffly. "Yes, sir." "There's no need to call me "sir" Professor." The words had escaped him before he knew what he was saying. - J. K. Rowling from https://whatsmyquote.com/quote/do-you-remember-me-telling-you-we-are-practicing-non-verbal-spells-potter-yes-said-harry-stiffly-yes-sir-there