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Priori certainty (n.) always ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠proves, here as everywhere, to be something purely logical — as with the law of least action, surmised before anyone knew how it went.