9.
The Chapter on Searches
1-12.
The Twelve Discourses Beginning with Searches
792-802. Thus the Search Chapter is to be expanded - with the removal of lust as its final goal, with the removal of hate as its final goal, with the removal of delusion as its final goal.
The Search Chapter is the ninth.
Its summary:
Search, discrimination, mental corruption, existence and suffering, three;
Barrenness, stain, and trouble, feeling, craving, and with thirst.