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  1. Pick any set of objects A, e.g. A={duck}.
  2. Derive the attributes A'={small, two legs, feathers, fly, swim}
  3. Derive (A')'={small, two legs, feathers, fly, swim}'={duck, goose}
  4. (A'',A')=({duck, goose},{small, two legs, feathers, fly, swim}) is a formal concept.

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