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Book 2, Chapt. 25. It begins this way:

We have Reduction (???????, abduction):
:# When it is obvious that the first term applies to the middle, but that the middle applies to the last term is not obvious, yet is nevertheless more probable or not less probable than the conclusion;
:# Or if there are not many intermediate terms between the last and the middle;For in all such cases the effect is to bring us nearer to knowledge.

By way of explanation, Aristotle

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