Have there been any systematic attempts to determine what the most difficult language(s) to learn as a second-language may be? Is the difficulty of second-language acquisition necessarily tied to the second-language's similarity to one's first language, or otherwise dependent on some inherent or acquired capacity of one's brain to learn a given second-language? Or are there some languages which are more difficult to learn as a second-language across the board, so to speak? If so, what sort of formulae might be used to determine the difficulty of the acquisition of a given second-language?
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