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:
The principal initiator was Pu (grandfather) Kaeo, together with his siblings, who sponsored the writing of this manuscript entitled Seven Treatises of Abhidhamma, so that Buddhism could be prolonged until [the end of] 5,000 years. May the merit derived from writing this manuscript be transferred to my younger brother named Nan (ex-monk) Sīvijaya.