 A study of the categories will, in short, be helpful in giving concrete examples of the logical doctrines presented. The same arguments in removing the Categories from logic should apply to texts which investigate the commonplace reasoning of the Topics, though I have not seen such an argument made by an Arabic logician. It is not clear to me that the argument to exclude the Categories from logic which, in Hillî's version, depends on taking secondary intelligibles to be the subject matter of logic, still works for those who do not accept logic's subject matter to be secondary intelligibles; none the less, the Categories were excluded from their works too.