Aristotle - The Organon - index for DE SOPHISTICIS ELENCHIS Section 3 Part 19

Equivocal premisses versus equivocal conclusions

Paragraph 1	Of the refutations, then, that depend upon ambiguity and amphiboly some contain some question with more than one meaning, while others contain a conclusion bearing a number of senses:
Paragraph 2	Whenever, then, the many senses lie in the conclusion no refutation takes place unless the sophist secures as well the contradiction of the conclusion he means to prove;