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The gold standard textbook on language contact made this crystal clear: lexical borrowing is easy and casual. Structural borrowing is rare and requires deep, prolonged, intense contact.
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One can't ignore the structural similarities between the Tirukkuṟaḷ and Sanskrit treatises. In the Arthaśāstra (Book VI, Chapter 1, Prakṛtisampadaḥ), Kauṭilya enumerates the seven constituents of sovereignty (Saptāṅga Rājya): svāmin (king), amātya (minister), janapada (territory), durga (fortress), kośa (treasury), daṇḍa (army), and mitra (ally).
A place in Sahabad district called Khārgaḍh or Khayaragaḍh (fortress of Khayara) is presumed to be the place where the Khayaravāla dynasty was founded.