The content mentions about Paticca-samuppāda (the dependent origination) which is the chain or law of dependent origination, or the chain of causation, a fundamental concept of Buddhism describing the causes of suffering and the course of events that lead a being through rebirth, old age, and death. Existence is seen as an interrelated flux of phenomenal events, material and psychical, without any real, permanent, independent existence of their own. These events happen in a series, one interrelating group of events producing another. The series is usually described as a chain of 12 links.