Yamaka is the sixth book of Abhidhamma. This book is in ten chapters, each dealing with a particular topic of Buddhist teaching: Roots (Mula), Aggregates (Khanda), Bases (Ayatana), Elements (Dhatu), Truths (Sacca/Satya), Formations (Sankhara/Sanskara), Latent States (Anusaya), Consciousness (Citta/Chitta), Phenomena (Dhamma) and Sense Faculties (Indriya).
Colophon:
Saen Nangsü Thao (experienced bookworm) completed the writing [of this manuscript] on the first waxing-moon day of the eleventh [lunar] month, a Thursday, at the time of the forenoon horn. This Vohāra-abhidhamma is called Yamakapakaraṇa, sixth fascicle.