abugida affricate consonant alveolar consonant approximant consonant asia bernard comrie bilabial consonant burma burmese china fricative consonant glottal consonant internal conflict in burma international phonetic alphabet kachin state kam-tai keng tung khamti language family lanna lao laos list of languages by number of native speakers merritt ruhlen mong mao nasal consonant northern thailand palatal consonant phoneme sagaing division salween river semivowel shan shan state syllable syllable onset syllable rime tai-kadai languages tai languages thai language thailand tonal language tone trill consonant unicode velar consonant yunnan