وشرائط إنتاج الشكل الرابع مع كثرتها وقلة حدودها مذكورة في المبسوطات
The conditions for producing results in the fourth figure, being numerous and having fewer limits, are discussed in extended treatises.
The main text deliberately does not set out every condition in this concise manual. In the same printed edition, the notes expand the topic with two broad requirements and a table marking eight productive cases.
It is useful to distinguish the short original exposition from the pedagogical elaboration in the notes, and then assess each proposed result by its own valid proof.