For example, the Vai syllabary originally had separate glyphs for syllables ending in a coda "(doŋ)," a long vowel "(soo)," or a diphthong "(bai)," though not enough glyphs to distinguish all CV combinations (some distinctions were ignored). The modern script has been expanded to cover all moras, but at the same time reduced to exclude all other syllables. Bimoraic syllables are now written with two letters, as in Japanese: diphthongs are written with the help of V or "h"V glyphs, and the nasal coda is written with the glyph for "ŋ", which can form a syllable of its own in Vai.