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Wikipedia definition
1. Duck testThe duck test is a humorous term for a form of inductive reasoning. This is its usual expression: “ If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck. ” The test implies that a person can identify an unknown subject by observing that subject's habitual characteristics. It is sometimes used to counter abstruse arguments that something is not what it appears to be.
Read “Duck test” on English Wikipedia
Read “ダック・テスト” on Japanese Wikipedia
Read “Duck test” on DBpedia

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