Itacisms in P46

Papyrus 46 - The significance of P46 from the Chester Beatty collection can hardly be overestimated. Dated with confidence about a.d. 200, it provides what is by far the earliest nearly complete text of Galatians ... The total number of variations comes to 136, but 44 of them consist of orthographic differences that have no intrinsic significance, and so we can dismiss them from further discussion except to note two matters. A full 17 of these differences are cases of itacism, in particular the use of the diphthong ei where the UBS3 text has i. [Moises Silva, The Text of Galatians in Scribes and Scripture, p. 18]