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Ab uno disce omnes. (Latin term)
Translation: "From one, learn all."

"From one sample, judge or know all the rest." From Virgil's Aeneid. This maxim, or rule, applies to situations in which the acceptance of a single observation is universally applicable. Such a careless application is considered a trap for faulty generalizations; like et sic de similibus, "and so of similar (people or things)"; "and that goes for the others, too."