The internal structure of Afroasiatic is far from resolved, and the literature contains many competing models (cf. review in Blench 2006). Nonetheless, the grammar of Berber aligns it strongly with Semitic, and most genealogical trees place these two branches in proximity. Berber verbal affixes are strikingly similar to those of Semitic, both in form, function and position as prefixes or suffixes, and must be inherited from the common ancestor of Berber and Semitic (Lipinski 2001:44).