The book's sequence is primarily chronological based on the narrative content of the book. Exceptions include the Words of Mormon and the Book of Ether. The Words of Mormon contains editorial commentary by Mormon. The Book of Ether is presented as the narrative of an earlier group of people who had come to America before the immigration described in 1 Nephi. First Nephi through Omni are written in first-person narrative, as are Mormon and Moroni. The remainder of the Book of Mormon is written in third-person historical narrative, said to be compiled and abridged by Mormon (with Moroni abridging the Book of Ether and writing the latter part of Mormon and the Book of Moroni).