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[3] Nor are enthymemes by which arguments are refuted of a different kind from those by which they are established; for it is clear that demonstration or bringing an objection is the means of refutation. By the first the contrary of the adversary's conclusion is demonstrated; for instance, if he has shown that a thing has happened, his opponent shows that it has not; if he has shown that a thing has not happened, he shows that it has. This, therefore, will not be the difference between them; for both employ the same arguments; they bring forward enthymemes to show that the thing is or that it is not.

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