Aristotle's Ethica Eudemia Book 2 Chapter 2 contains, at lines 1220b10–11, a well-known crux in the phrase ἐν τοῖς ἀπηλλαγμένοις. The context makes clear that Aristotle is using this phrase to refer to some writing or other, but scholars have been puzzled both about what the phrase means and what writing it refers to.