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In page Sanskrit:

"

However some scholars have suggested that the original Ṛg-veda differed in some fundamental ways in phonology compared to the sole surviving version available to us. In particular that retroflex consonants did not exist as a natural part of the earliest Vedic language,[4] and that these developed in the centuries after the composition had been completed, and as a gradual unconscious process during the oral transmission by generations of reciters.[citation needed]