Table 1 A hypothetical model of the formation of the Old Chinese pharyngealization contrast ULE Way DaCk LO ULE Calll€st UG GHIIESe, However, as Baxter & Sagart observe (2014:73-74), such a phonological system is typologically unusual: languages with pharyngealized consonants generally have more nonpharyngealized consonants than pharyngealized ones. We think of typologically unusual features as short-lived and unstable, though not necessarily impossible. It is entirely possible that the onset consonant inventory in Table 1 existed only for a short period of time at the end of the oc period.