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> And as for recognizing a cat or a dog — that's a problem so trivial today

Last time I checked - though it's been a long while I could not check thoroughly owing to other commitments - "«recognizing»" there was "consistently successfully guessing", not "critically defining". It may be that the problem was solved in the latest years, I cannot exclude it - but I have not seen around in the brief "news checking" exercise the signals required for the solution.

The real deal is far from trivial.

A clock can tell the time but does not know it.



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