وحالها في الأشكال الأربعة
Their arrangement is discussed through the four figures.
The common component again plays the role of a middle term. Its position in the two premises distinguishes the four figures, just as in categorical syllogisms.
The book likens the figures, productive moods, and required conditions of these syllogisms to their categorical counterparts. This does not license an inference from any arbitrarily paired conditionals.