Dependent Origin or Pratītyasamutpāda is defined as
It states that all dharmas (phenomena) arise in dependence upon other dharmas
And then there are these 12 causes one after another, each depending on the next one starting from Aging or decay, and death (Jarāmaraṇa) which depends on Birth, Rebirth (Jāti) and so on, which finally ends in Ignorance, nescience (Avidyā).
But notice Avidya seems to be not depending on anything. But as a rule all dharmas should be dependent on another dharma. How is this contradiction reconciled?