大般涅槃經義記 4.84

4.84

初章如是，將初十二單呼迦等三十四字為第二章，用十二音呼一迦字生十二字即為一遍，乃至呼荼類亦同爾，三十四遍合為一章。

Such is the first chart. Taking the first twelve to vocalise simply the thirty-four letters such as *jia* forms the second chart: using the twelve sounds to vocalise the single letter *jia* generates twelve letters, which constitutes one round; and so on down to vocalising *tu*, which is also like this; thirty-four rounds combined form one chart.