While the many conjugation classes may seem overwhelming, most of them contain few verbs. The quadrigrade and lower bigrade classes are the primary, containing about 75% and 20% of the verbs in the language, respectively. The upper bigrade class is small (about 56 non-compound verbs), but sizable enough to make an exhaustive list difficult. The other 6 classes all together contain between 22 and 28 verbs, depending on whether basic compound verbs are included or not. An exhaustive list of these follows, which verbs in the conclusive form, as is the most-common standard. Chinese character pronunciations are indicated by hiragana in parentheses following the given character. The first spelling listed for a given verb is the most common, and those that follow are alternative spellings. Some of these spellings are generally used for slightly different connotations of the same verb, while others are simple alternatives. In later reference, only the first spelling (in pre-World War II orthography) will be used, and the transcription will be based on the historical spelling. A blank cell in one (or both) of the "modern" columns indicates that the modern spelling and/or transcription is the same as the pre-World War II version.