The literary character of the "Politics" is subject to some dispute, growing out of the textual difficulties that attended the loss of Aristotle's works. Book III ends with a sentence that is repeated almost verbatim at the start of Book VII, while the intervening Books IV–VI seem to have different flavor from the rest; Book IV seems to refer several times back to the discussion of the best regime contained in Books VII–VIII. Some editors have therefore inserted Books VII–VIII after Book III. At the same time, however, references to the "discourses on politics" that occur in the "Nicomachean Ethics" suggest that the treatise as a whole ought to conclude with the discussion of education that occurs in Book VIII of the "Politics", although it is not certain that Aristotle is referring to the "Politics" here.