| Paragraph 1 | In the second figure whenever both premisses are problematic, no syllogism is possible, whether the premisses are affirmative or negative, universal or particular. |
| Paragraph 2 | First we must point out that the negative problematic proposition is not convertible, e |
| Paragraph 3 | Moreover it is not possible to prove the convertibility of these propositions by a reductio ad absurdum, i |
| Paragraph 4 | This being proved, suppose it possible that A may belong to no B and to all C. |
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