The standard Japanese terms, "ichidan" and "godan", literally "one row" and "five rows", more formally "monograde" and "pentagrade", correspond to the number of different morae (kana) that appear in the stem forms of the verb, which are then optionally combined with a suffix to form a conjugated word. Formally, verbs are classified by which column of the gojūon their stem ends in, with vowel stem verbs further distinguished into "i" and "e" type. For example, 読む "yomu" is of マ行五段活用 "ma-gyō go-dan katsuyō" "ma-column five-row conjugation" type, as its stem form end in each of the five rows of the ま column, namely まみむめも: