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Reminds me of the analogy games described by Hofstader in one of his books.

Like "New Zealand is the Scotland of Australia". If i remember correctly, the idea was to take two pairs of countries and construct an analogous mapping between them.

So Spain::Portugal -> UK::USA in this case.

There should be a third mapping there---"neither". I got 99% British with my normal (more or less foreign-accent-free) speach and a whooping 88% British with the heaviest Polish accent I could produce.

The NN (I guess) checks the accent, so it doesn't care about the content of the words. One could speak Spanish in a more or less British accent.

Yes, it would break your words into phonetics, and analyzes whether it's "american" or "british" phonetics which occur more frequently in the dialog. Unless well practiced, your phonetics likely cary over into other languages that you speak.