Check this article out. There's a whole section about the Indian subcontinent, and a paragraph that talks about Sanskrit. I'm no expert in Sanskrit so can't verify or write a full answer.
– IgnatiusMar 27 '19 at 14:29
Thanks for the article, but it only gives examples. It doesnt seem to explain the grammatical rules behind it.
– Vk1Mar 27 '19 at 15:08
1 Answers1
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This phenomenon is called guna and vṛddhi. You can learn more here for example: