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Aristotle - The Organon - index for ANALYTICA PRIORIA Book 2 Part 10

... in the third figure

  
Paragraph 1 In the third figure when the conclusion is converted into its contrary, neither of the premisses can be refuted in any of the syllogisms, but when the conclusion is converted into its contradictory, both premisses may be refuted and in all the moods.
Paragraph 2 Similarly if the original syllogism is negative.
Paragraph 3 From what has been said it is clear how a syllogism results in each figure when the conclusion is converted;


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