According to John Tvedtnes, despite the paucity of genealogical details in the Book of Mormon, clearly the people were very concerned about their tribal affiliation. For example, Book of Mormon personal names containing such Semitic patronymic elements as Abi- ("father") and Ami- ("paternal kinsman/clan") fit the biblical pattern and are evidence for a strong patrilineal kinship system. Note the names "Abinadi" (Mosiah 11:20), "Abinadom" (Omni 1:10), "Aminadab" (Helaman 5:39), and "Aminadi" (Alma 10:2). [John A. Tvedtnes, "Book of Mormon Tribal Affiliation and Military Castes," in Warfare in the Book of Mormon, F.A.R.M.S., p. 297]