Text: Early events surrounding the Indo-Aryans can be deduced from the later writings of the Rig-Veda (priestly hymns), Puranas (ancient tales of kings and gods), and the epic poems of the Mahabharata and Ramayana.
Entailment: The later writings of the RIg-Veda had to do with Indo-Aryans.
Contradiction: The earliest writings of the RIg-Veda had to do with Indo-Aryans.