The syllables in Manchu are divided into twelve categories called "uju" (literally "head") based on their syllabic codas (final phonemes). Here lists the names of the twelve "uju" in their traditional order:a, ai, ar, an, ang, ak, as, at, ab, ao, al, am.Each "uju" contains syllables ending in the coda of its name. Hence, Manchu only allows nine final consonants for its closed syllables, otherwise a syllable is open with a monophthong ("a" "uju") or a diphthong ("ai" "uju" and "ao" "uju").The syllables in an "uju" are further sorted and grouped into three or two according to their similarities in pronunciation and shape. For example, "a uju" arranges its 131 licit syllables in the following order:a, e, i; o, u, ū; na, ne, ni; no, nu, nū;