MC: Middle Chinese
OB: Old Burmese
OC: Old chinese
OT: Old Tibetan
PAA: Proto-Austroasiatic
PAN: Proto-Austronesian
PH: Proto-Hmongic
PHM: Proto-Hmong-Mien
PM: Proto-Mienic
PMP: Proto-Malayo-Polynesian
PST: Proto-Sino-Tibetan
PTB: Proto-Tibeto-Burman
PTK: Proto-Tai-Kadai
WB: Written Burmese
WT: Written Tibetan
