they - 35 occurrences in 18 verses - 1 Nephi 15:2, 3, 4, 7, 9, 14, 15, 16, 17, 20, 21, 23, 24, 25, 26, 31, 32, 33
they must - 5 occurrences in 3 verses - 1 Nephi 15:4, 32, 33