academic agreement. Usage A word is consistently, without exception, written with syllables from a specific group. For example, /kami1/ "above" and /kami2/ "god". While both words consist of an /m/ and an /i/, mi1 cannot substitute for mi2 or vice versa. This strict distinction exists for all of the syllables marked in gray. This usage is also found in the verb morphology. The quadrigrade conjugation is as follows: The verb /sak-/ "bloom" has quadrigrade conjugation class. Thus, its conjugation is as follows: Before the jōdai tokushu kanazukai discovery, it was thought that quadrigrade realis and imperative shared the same form: -e. However, after the discovery, it became clear that realis was -e2 while imperative was -e1. Also, jōdai tokushu kanazukai has a profound effect on etymology. It was once thought that /kami/ "above" and /kami/ "god" shared the same etymology, a god being an entity high above. However, after the discovery, it is known that "above" is /kami1/ while "god" is /kami2/. Thus, they are distinct words. Man'yōgana chart The following chart lists syllable and man'yōgana correspondences. Development The distinction between /mo1/ and /mo2/ is only made in the oldest text: Kojiki. After that, they merged into /mo/. In later texts, confusion between types A and B can be seen. Nearly all of the A/B distinctions had vanished by the Classical Japanese period. As seen in early Heian Period texts such as Kogo Shūi, the final syllables to be distinguished were /ko1, go1/ and /ko2, go2/. After the merger, CV1 and CV2 became CV. See also Kogo Shūi, an 807 text that maintains several historical phonetic distinctions Tōdaiji Fujumonkō, a c. 9th-century text that maintains the /ko1, ko2/ distinction Bibliography Nara period Japanese writing system Kanji Kana Archaic Japanese language Japanese orthography