 The last two can be reconstructed with the aid of the Oghur languages, which show for *ŕ, *ĺ, while Common Turkic has *z, *š. Oghuric is thus sometimes referred to as Lir-Turkic and Common Turkic as Shaz-Turkic.However, an alternate theory holds that Common Turkic is closer to the original state of affairs and reconstructs Proto-Turkic *z, *š.The glottochronological reconstruction based on analysis of isoglosses and Sinicisms points to the timing of the "r/z" split at around 56 BCE–48 CE.