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Aristotle - The Organon - index for ANALYTICA PRIORIA Book 2 Part 12

... in the second figure

  
Paragraph 1 It is clear then that in the first figure all problems except the universal affirmative are proved per impossibile.
Paragraph 2 When A belongs to some B, suppose that A belongs to no B, and let A belong to all C.
Paragraph 3 Again suppose that A belongs to some B, and let A belong to no C.
Paragraph 4 When A does not belong to an B, suppose it does belong to all B, and to no C.


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