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Dhammasaṅgaṇī
The Dhammasaṅgaṇī (Compendium of Phenomena) is built on the idea of a <i lang='pi' translate='no'>mātikā</i>, a lists of contents or matrix. A <i lang='pi' translate='no'>mātikā</i> acts as a simple instance of a template that is applied and transformed in ever more complex forms throughout the work. The Dhammasaṅgaṇī <i lang='pi' translate='no'>mātikās</i> list sets of phenomena (<i lang='pi' translate='no'>dhammas</i>). Most of these are doctrinal terms familiar from the suttas, although some are specialized Abhidhamma terms. The Dhammasaṅgaṇī starts with three <i lang='pi' translate='no'>mātikās</i>. The first classifies <i lang='pi' translate='no'>dhammas</i> into 22 sets of three (<i lang='pi' translate='no'>tika</i>), and the next two use sets of two (<i lang='pi' translate='no'>duka</i>), 100 pairs for Abhidhamma terms, and 42 for Sutta terms. The first of the triple sets is the momentous group: wholesome, unwholesome, and undetermined. This serves as a framework for classifying all the various phenomena. While it seems simple enough, even this detail was controversial, as some schools rejected the existence of the undetermined, or morally neutral, category.