The Pashtun tribes (), are the tribes of the Pashtun people, a large Eastern Iranian ethnic group who use the Pashto language and follow Pashtunwali code of conduct. They are found primarily in Afghanistan and Pakistan and form the world's largest tribal society, comprising over 49 million people and between 350 and 400 tribes and clans. They are traditionally divided into four tribal confederacies: the Sarbani (), the Bettani (), the Gharghashti () and the Karlani (). Folkloric genealogies trace the descendants of the Pashtuns to Qais Abdur Rashid and his three sons Saṛban (), Bēṭ (), and Gharghax̌t () as well as an adopted son, not directly adopted by Qais Abdul Rashid, therefore, the identity of Karlan himself and the man who adopted him, according to some books written on the history of the Pashtuns, is either unclear or controversial, the Karlani confederacy Ormur Baraki, who became the progenitor of the Karlani. There are several levels of organisation of Pashtun tribes. The "tribe" is subdivided into kinship groups, each of which is a khel and zai. A khel or zai is further divided into plarina, each of which consists of several extended families. A large tribe often has dozens of subtribes whose members may see themselves as belonging to each, some or all of the sub-tribes in their family tree depending upon the social situation: co-operative, competitive or confrontational. Etymologies Tarbur refers to a "tribe" split into two or more clans. Tarbur means "cousin" in Pashto, so tarbur could be an enemy as well in the Pashtun culture that they can occupy your land or property. Every Pashtun tribe is then divide into subtribes, also called khel or zai. Zai in Pashto means "descendant".William Crooke has said that khel is from an Arabic word meaning "association" or "company". A khel is often based in a single village, but it may also be based on a larger area including several villages, or part of a town. Plarina is related to the Bactrian term plār, which derives from Old Iranian piðar (in Bactrian and Pashto, Old Iranian /ð/ usually yields /l/), and is related to Sanskrit pitar and English "father". The plural form of plār is plārina. A plārina is considered only when the 7th generation is born, meaning the father of multiple families (kahol). Usually, the 7th forefather is assumed to take from one-and-a-half century to two centuries. Kul (plural