 In vertical text contexts, which used to be the default case, the grid is usually presented as 10 columns by 5 rows, with vowels on the right hand side and ア ("a") on top.Katakana glyphs in the same row or column do not share common graphic characteristics.Three of the syllabograms to be expected, "yi", "ye" and "wu", may have been used idiosyncratically with varying glyphs, but never became conventional in any language and are not present at all in modern Japanese.